- Parts of a domain name
- Second-level Domain
Second-level domains (SLD): Domain names and mandatory country code second level domains.
Generally speaking, a second-level domain (SLD) is the registrable part of a domain name, the "example" in example.com, the name you choose, pay for annually, and own the exclusive right to use within the domain name system (DNS).
TLD-list
Editor team
An SLD sits directly to the left of the top-level domain (TLD) and to the right of any subdomain, and it's usually the piece people mean when they talk about a brand's web address or online presence. This article covers how SLDs work, the special case of country-code SLDs, naming rules, and what to check before registering, so the name you land on is unique and memorable rather than one more forgettable string of characters.
What is a second-level domain?
The second-level domain is the label in a domain name that sits directly below the TLD in the DNS hierarchy. In example.com, "example" is the SLD and .com is the TLD. The SLD is what you register with an ICANN-accredited registrar, and it is the component that gives your domain its identity, its brand identity and online identity rolled into a single string of characters.
"Second-level" refers to position in the hierarchy (counting from the right, with the TLD as the first level), not to importance or size. The label can represent a brand name, a personal name, a project name, a descriptive term, or a target keyword. Whether you are launching a business, a portfolio, or a publication, the SLD is what sets your domain apart from every other domain registered under the same top-level domain (TLD), and a good one is instantly recognizable well before anyone reads the extension.
How the SLD fits into the domain hierarchy
A domain name is built from labels separated by dots, each occupying a level in the DNS hierarchy. This layered domain name structure, subdomain, SLD, TLD, is what determines who controls each part and what it costs. These domain levels are counted from right to left, with the TLD as level one and the SLD as level two. Using blog.tld-list.com as a labeled example:
- blog is the subdomain (third level). The domain owner configures it and can create it at no cost. Subdomains are optional labels layered on top of the SLD, not a separate registration.
- tld-list is the second-level domain (SLD). This is the registered name, the SLD occupies the second-level hierarchy, sitting between the subdomain and the TLD. The owner pays an annual renewal fee to keep it.
- .com is the top-level domain (TLD). It is managed by a registry (Verisign manages .com), alongside other generic TLDs such as .org and .edu.
Understanding the hierarchy of the domain name this way clarifies an important distinction: the actual domain name is the SLD plus the TLD (tld-list.com); the subdomain is an optional prefix the owner can add or remove without touching the registration itself. Combine a subdomain like www with the registered SLD and TLD and you get the complete web address, for example, https://www.example.com, even though www.example.com and example.com point to the same registration.
| Domain part | Position | Who controls it | Reg. required | Example in www.tld-list.com |
|---|---|---|---|---|
| Subdomain (3LD) | Left of SLD | Owner (free to create) | No | www |
| Second-level domain (SLD) | Left of TLD | Owner (annual fee) | Yes | tld-list |
| Top-level domain (TLD) | Rightmost label | Registry (e.g. Verisign) | No (chosen at reg.) | .com |
Country-code second-level domains (ccSLDs)
In some country-code TLD (ccTLD) the registry adds a mandatory or optional second level to indicate the type of registrant. When this happens, the registrable domain isn't the second-level domain but the third-level domain instead. This approach is common among national registries that want to categorize registrations by use type rather than allowing open registration directly under the two-letter ccTLD.
See below the list of all available second-level domains by country:
| Country | Second-level domain |
|---|---|
Second level domains available for registration in Afghanistan |
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Second level domains available for registration in Albania |
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Second level domains available for registration in Algeria |
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Second level domains available for registration in Angola |
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Second level domains available for registration in Anguilla |
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Second level domains available for registration in Antigua and Barbuda |
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Second level domains available for registration in Argentina |
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Second level domains available for registration in Armenia |
.co.am, .com.am, .net.am, .north.am, .org.am, .radio.am, .south.am |
Second level domains available for registration in Aruba |
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Second level domains available for registration in Australia |
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Second level domains available for registration in Austria |
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Second level domains available for registration in Azerbaijan |
.biz.az, .co.az, .com.az, .edu.az, .gov.az, .info.az, .int.az, .mil.az, .name.az, .net.az, .org.az, .pp.az, .pro.az |
Second level domains available for registration in the Bahamas |
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Second level domains available for registration in Bahrain |
.biz.bh, .cc.bh, .com.bh, .edu.bh, .me.bh, .name.bh, .net.bh, .org.bh |
Second level domains available for registration in Bangladesh |
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Second level domains available for registration in Barbados |
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Second level domains available for registration in Belarus |
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Second level domains available for registration in Belize |
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Second level domains available for registration in Benin |
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Second level domains available for registration in Bermuda |
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Second level domains available for registration in Bhutan |
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Second level domains available for registration in Bolivia |
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Second level domains available for registration in Bosnia and Herzegovina |
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Second level domains available for registration in Botswana |
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Second level domains available for registration in Brazil |
.abc.br, .adm.br, .adv.br, .agr.br, .am.br, .aparecida.br, .app.br, .arq.br, .art.br, .ato.br, .belem.br, .bhz.br, .bib.br, .bio.br, .blog.br, .bmd.br, .boavista.br, .bsb.br, .campinas.br, .caxias.br, .cim.br, .cng.br, .cnt.br, .com.br, .coop.br, .curitiba.br, .des.br, .det.br, .dev.br, .ecn.br, .eco.br, .edu.br, .emp.br, .enf.br, .eng.br, .esp.br, .etc.br, .eti.br, .far.br, .flog.br, .floripa.br, .fm.br, .fnd.br, .fortal.br, .fot.br, .foz.br, .fst.br, .g12.br, .geo.br, .ggf.br, .gov.br, .gru.br, .imb.br, .ind.br, .inf.br, .jampa.br, .jor.br, .lel.br, .log.br, .macapa.br, .maceio.br, .manaus.br, .mat.br, .med.br, .mil.br, .mus.br, .natal.br, .net.br, .nom.br, .not.br, .ntr.br, .odo.br, .org.br, .palmas.br, .poa.br, .ppg.br, .pro.br, .psc.br, .psi.br, .qsl.br, .radio.br, .rec.br, .recife.br, .rep.br, .rio.br, .salvador.br, .seg.br, .sjc.br, .slg.br, .srv.br, .taxi.br, .tec.br, .teo.br, .tmp.br, .trd.br, .tur.br, .tv.br, .vet.br, .vix.br, .vlog.br, .wiki.br, .zlg.br |
Second level domains available for registration in Brunei |
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Second level domains available for registration in Burundi |
.co.bi, .com.bi, .edu.bi, .info.bi, .mo.bi, .net.bi, .or.bi, .org.bi |
Second level domains available for registration in Cambodia |
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Second level domains available for registration in Cameroon |
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Second level domains available for registration in Cape Verde |
.com.cv, .edu.cv, .int.cv, .net.cv, .nome.cv, .org.cv, .publ.cv |
Second level domains available for registration in Cayman Islands |
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Second level domains available for registration in Chad |
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Second level domains available for registration in China |
.ac.cn, .ah.cn, .bj.cn, .com.cn, .cq.cn, .fj.cn, .gd.cn, .gs.cn, .gx.cn, .gz.cn, .ha.cn, .hb.cn, .he.cn, .hi.cn, .hk.cn, .hl.cn, .hn.cn, .jl.cn, .js.cn, .jx.cn, .ln.cn, .mo.cn, .net.cn, .nm.cn, .nx.cn, .org.cn, .qh.cn, .sc.cn, .sd.cn, .sh.cn, .sn.cn, .sx.cn, .tj.cn, .tw.cn, .xj.cn, .xz.cn, .yn.cn, .zj.cn |
Second level domains available for registration in Colombia |
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Second level domains available for registration in the Comoros |
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Second level domains available for registration in Cook Islands |
.biz.ck, .co.ck, .edu.ck, .gen.ck, .gov.ck, .info.ck, .net.ck, .org.ck |
Second level domains available for registration in Costa Rica |
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Second level domains available for registration in Croatia |
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Second level domains available for registration in Cuba |
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Second level domains available for registration in Curaçao |
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Second level domains available for registration in Cyprus |
.ac.cy, .biz.cy, .com.cy, .ekloges.cy, .ltd.cy, .name.cy, .net.cy, .org.cy, .parliament.cy, .press.cy, .pro.cy, .tm.cy |
Second level domains available for registration in the Czech Republic |
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Second level domains available for registration in DR Congo |
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Second level domains available for registration in Denmark |
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Second level domains available for registration in Dominica |
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Second level domains available for registration in the Dominican Republic |
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Second level domains available for registration in Ecuador |
.com.ec, .fin.ec, .info.ec, .med.ec, .net.ec, .org.ec, .pro.ec |
Second level domains available for registration in Egypt |
.com.eg, .edu.eg, .eun.eg, .gov.eg, .info.eg, .name.eg, .net.eg, .org.eg, .tv.eg |
Second level domains available for registration in El Salvador |
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Second level domains available for registration in Estonia |
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Second level domains available for registration in Eswatini |
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Second level domains available for registration in Ethiopia |
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Second level domains available for registration in the Falkland Islands |
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Second level domains available for registration in Fiji |
.ac.fj, .biz.fj, .com.fj, .info.fj, .name.fj, .net.fj, .org.fj, .pro.fj |
Second level domains available for registration in France |
.aeroport.fr, .asso.fr, .avocat.fr, .chambagri.fr, .chirurgiens-dentistes.fr, .com.fr, .experts-comptables.fr, .geometre-expert.fr, .gouv.fr, .medecin.fr, .nom.fr, .notaires.fr, .pharmacien.fr, .port.fr, .prd.fr, .presse.fr, .tm.fr, .veterinaire.fr |
Second level domains available for registration in French Polynesia |
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Second level domains available for registration in Georgia |
.com.ge, .edu.ge, .gov.ge, .mil.ge, .net.ge, .org.ge, .pvt.ge |
Second level domains available for registration in Germany |
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Second level domains available for registration in Ghana |
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Second level domains available for registration in Gibraltar |
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Second level domains available for registration in Greece |
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Second level domains available for registration in Greenland |
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Second level domains available for registration in Guadeloupe |
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Second level domains available for registration in Guam |
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Second level domains available for registration in Guatemala |
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Second level domains available for registration in Guernsey |
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Second level domains available for registration in Guinea |
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Second level domains available for registration in Guyana |
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Second level domains available for registration in Haiti |
.adult.ht, .art.ht, .asso.ht, .com.ht, .edu.ht, .firm.ht, .info.ht, .net.ht, .org.ht, .perso.ht, .pol.ht, .pro.ht, .rel.ht, .shop.ht |
Second level domains available for registration in Honduras |
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Second level domains available for registration in Hong Kong |
.com.hk, .edu.hk, .gov.hk, .idv.hk, .inc.hk, .ltd.hk, .net.hk, .org.hk, .個人.香港, .公司.hk, .公司.香港, .政府.香港, .教育.香港, .組織.香港, .網絡.香港 |
Second level domains available for registration in Hungary |
.2000.hu, .agrar.hu, .bolt.hu, .casino.hu, .city.hu, .co.hu, .erotica.hu, .erotika.hu, .film.hu, .forum.hu, .games.hu, .hotel.hu, .info.hu, .ingatlan.hu, .jogasz.hu, .konyvelo.hu, .lakas.hu, .media.hu, .news.hu, .org.hu, .priv.hu, .reklam.hu, .sex.hu, .shop.hu, .sport.hu, .suli.hu, .szex.hu, .tm.hu, .tozsde.hu, .utazas.hu, .video.hu |
Second level domains available for registration in India |
.5g.in, .6g.in, .ahmdabad.in, .ai.in, .am.in, .bihar.in, .biz.in, .business.in, .ca.in, .cn.in, .co.in, .com.in, .coop.in, .cs.in, .delhi.in, .dr.in, .er.in, .firm.in, .gen.in, .gujarat.in, .ind.in, .info.in, .int.in, .internet.in, .io.in, .me.in, .net.in, .org.in, .pg.in, .post.in, .pro.in, .travel.in, .tv.in, .uk.in, .up.in, .us.in, .كمپنی.بھارت, .कंपनी.भारत, .কোম্পানি.ভারত, .ਕੰਪਨੀ.ਭਾਰਤ, .કંપની.ભારત, .நிறுவனம்.இந்தியா, .కంపెనీ.భారత్ |
Second level domains available for registration in Indonesia |
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Second level domains available for registration in Iran |
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Second level domains available for registration in Iraq |
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Second level domains available for registration in the Isle of Man |
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Second level domains available for registration in Israel |
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Second level domains available for registration in Italy |
.abr.it, .abruzzo.it, .ag.it, .agrigento.it, .al.it, .alessandria.it, .alto-adige.it, .altoadige.it, .an.it, .ancona.it, .andria-barletta-trani.it, .andria-trani-barletta.it, .andriabarlettatrani.it, .andriatranibarletta.it, .ao.it, .aosta.it, .aoste.it, .ap.it, .aq.it, .aquila.it, .ar.it, .arezzo.it, .ascoli-piceno.it, .ascolipiceno.it, .asti.it, .at.it, .av.it, .avellino.it, .ba.it, .balsan.it, .bari.it, .barletta-trani-andria.it, .barlettatraniandria.it, .bas.it, .basilicata.it, .belluno.it, .benevento.it, .bergamo.it, .bg.it, .bi.it, .biella.it, .bl.it, .bn.it, .bo.it, .bologna.it, .bolzano.it, .bozen.it, .br.it, .brescia.it, .brindisi.it, .bs.it, .bt.it, .bz.it, .ca.it, .cagliari.it, .cal.it, .calabria.it, .caltanissetta.it, .cam.it, .campania.it, .campidano-medio.it, .campidanomedio.it, .campobasso.it, .carbonia-iglesias.it, .carboniaiglesias.it, .carrara-massa.it, .carraramassa.it, .caserta.it, .catania.it, .catanzaro.it, .cb.it, .ce.it, .cesena-forli.it, .cesenaforli.it, .ch.it, .chieti.it, .ci.it, .cl.it, .cn.it, .co.it, .como.it, .cosenza.it, .cr.it, .cremona.it, .crotone.it, .cs.it, .ct.it, .cuneo.it, .cz.it, .dell-ogliastra.it, .dellogliastra.it, .emilia-romagna.it, .emiliaromagna.it, .emr.it, .en.it, .enna.it, .fc.it, .fe.it, .fermo.it, .ferrara.it, .fg.it, .fi.it, .firenze.it, .florence.it, .fm.it, .foggia.it, .forli-cesena.it, .forlicesena.it, .fr.it, .friuli-v-giulia.it, .friuli-ve-giulia.it, .friuli-vegiulia.it, .friuli-venezia-giulia.it, .friuli-veneziagiulia.it, .friuli-vgiulia.it, .friuliv-giulia.it, .friulive-giulia.it, .friulivegiulia.it, .friulivenezia-giulia.it, .friuliveneziagiulia.it, .friulivgiulia.it, .frosinone.it, .fvg.it, .ge.it, .genoa.it, .genova.it, .go.it, .gorizia.it, .gr.it, .grosseto.it, .iglesias-carbonia.it, .iglesiascarbonia.it, .im.it, .imperia.it, .is.it, .isernia.it, .kr.it, .la-spezia.it, .laquila.it, .laspezia.it, .latina.it, .laz.it, .lazio.it, .lc.it, .le.it, .lecce.it, .lecco.it, .li.it, .lig.it, .liguria.it, .livorno.it, .lo.it, .lodi.it, .lom.it, .lombardia.it, .lombardy.it, .lt.it, .lu.it, .lucania.it, .lucca.it, .macerata.it, .mantova.it, .mar.it, .marche.it, .massa-carrara.it, .massacarrara.it, .matera.it, .mb.it, .mc.it, .me.it, .medio-campidano.it, .mediocampidano.it, .messina.it, .mi.it, .milan.it, .milano.it, .mn.it, .mo.it, .modena.it, .mol.it, .molise.it, .monza-brianza.it, .monza-e-della-brianza.it, .monza.it, .monzabrianza.it, .monzaebrianza.it, .monzaedellabrianza.it, .ms.it, .mt.it, .na.it, .naples.it, .napoli.it, .no.it, .novara.it, .nu.it, .nuoro.it, .og.it, .ogliastra.it, .olbia-tempio.it, .olbiatempio.it, .or.it, .oristano.it, .ot.it, .pa.it, .padova.it, .padua.it, .palermo.it, .parma.it, .pavia.it, .pc.it, .pd.it, .pe.it, .perugia.it, .pesaro-urbino.it, .pesarourbino.it, .pescara.it, .pg.it, .pi.it, .piacenza.it, .piedmont.it, .piemonte.it, .pisa.it, .pistoia.it, .pmn.it, .pn.it, .po.it, .pordenone.it, .potenza.it, .pr.it, .prato.it, .pt.it, .pu.it, .pug.it, .puglia.it, .pv.it, .pz.it, .ra.it, .ragusa.it, .ravenna.it, .rc.it, .re.it, .reggio-calabria.it, .reggio-emilia.it, .reggiocalabria.it, .reggioemilia.it, .rg.it, .ri.it, .rieti.it, .rimini.it, .rm.it, .rn.it, .ro.it, .roma.it, .rome.it, .rovigo.it, .sa.it, .salerno.it, .sar.it, .sardegna.it, .sardinia.it, .sassari.it, .savona.it, .si.it, .sic.it, .sicilia.it, .sicily.it, .siena.it, .siracusa.it, .so.it, .sondrio.it, .sp.it, .sr.it, .ss.it, .suedtirol.it, .sv.it, .ta.it, .taa.it, .taranto.it, .te.it, .tempio-olbia.it, .tempioolbia.it, .teramo.it, .terni.it, .tn.it, .to.it, .torino.it, .tos.it, .toscana.it, .tp.it, .tr.it, .trani-andria-barletta.it, .trani-barletta-andria.it, .traniandriabarletta.it, .tranibarlettaandria.it, .trapani.it, .trentino-a-adige.it, .trentino-aadige.it, .trentino-alto-adige.it, .trentino-altoadige.it, .trentino-s-tirol.it, .trentino-stirol.it, .trentino-sud-tirol.it, .trentino-sudtirol.it, .trentino-sued-tirol.it, .trentino-suedtirol.it, .trentino.it, .trentinoa-adige.it, .trentinoaadige.it, .trentinoalto-adige.it, .trentinoaltoadige.it, .trentinos-tirol.it, .trentinosud-tirol.it, .trentinosudtirol.it, .trentinosued-tirol.it, .trentinosuedtirol.it, .trento.it, .treviso.it, .trieste.it, .ts.it, .turin.it, .tuscany.it, .tv.it, .ud.it, .udine.it, .umb.it, .umbria.it, .urbino-pesaro.it, .urbinopesaro.it, .va.it, .val-d-aosta.it, .val-daosta.it, .vald-aosta.it, .valle-d-aosta.it, .valle-daosta.it, .valled-aosta.it, .valledaosta.it, .vao.it, .varese.it, .vb.it, .vc.it, .vda.it, .ve.it, .ven.it, .veneto.it, .venezia.it, .venice.it, .verbania.it, .vercelli.it, .verona.it, .vi.it, .vibo-valentia.it, .vibovalentia.it, .vicenza.it, .viterbo.it, .vr.it, .vs.it, .vt.it, .vv.it |
Second level domains available for registration in Ivory Coast |
.ac.ci, .co.ci, .com.ci, .ed.ci, .edu.ci, .go.ci, .in.ci, .int.ci, .net.ci, .nom.ci, .or.ci, .org.ci |
Second level domains available for registration in Jamaica |
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Second level domains available for registration in Japan |
.akita.jp, .co.jp, .gr.jp, .kyoto.jp, .ne.jp, .or.jp, .osaka.jp, .saga.jp, .tokyo.jp |
Second level domains available for registration in Jersey |
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Second level domains available for registration in Jordan |
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Second level domains available for registration in Kazakhstan |
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Second level domains available for registration in Kenya |
.ac.ke, .co.ke, .go.ke, .info.ke, .me.ke, .mobi.ke, .ne.ke, .or.ke, .sc.ke |
Second level domains available for registration in Kiribati |
.biz.ki, .com.ki, .edu.ki, .gov.ki, .info.ki, .mobi.ki, .net.ki, .org.ki, .phone.ki, .tel.ki |
Second level domains available for registration in Kuwait |
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Second level domains available for registration in Kyrgyzstan |
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Second level domains available for registration in Latvia |
.asn.lv, .com.lv, .conf.lv, .edu.lv, .id.lv, .mil.lv, .net.lv, .org.lv |
Second level domains available for registration in Lebanon |
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Second level domains available for registration in Lesotho |
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Second level domains available for registration in Liberia |
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Second level domains available for registration in Libya |
.com.ly, .id.ly, .med.ly, .net.ly, .org.ly, .plc.ly, .sch.ly |
Second level domains available for registration in Macau |
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Second level domains available for registration in Madagascar |
.co.mg, .com.mg, .mil.mg, .net.mg, .nom.mg, .org.mg, .prd.mg, .tm.mg |
Second level domains available for registration in Malawi |
.ac.mw, .biz.mw, .co.mw, .com.mw, .coop.mw, .edu.mw, .int.mw, .net.mw, .org.mw |
Second level domains available for registration in Malaysia |
.com.my, .edu.my, .gov.my, .mil.my, .name.my, .net.my, .org.my |
Second level domains available for registration in the Maldives |
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Second level domains available for registration in Mali |
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Second level domains available for registration in Malta |
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Second level domains available for registration in Mauritania |
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Second level domains available for registration in Mauritius |
.ac.mu, .co.mu, .com.mu, .edu.mu, .net.mu, .nom.mu, .or.mu, .org.mu |
Second level domains available for registration in Mexico |
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Second level domains available for registration in Micronesia |
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Second level domains available for registration in Monaco |
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Second level domains available for registration in Montserrat |
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Second level domains available for registration in Morocco |
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Second level domains available for registration in Myanmar |
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Second level domains available for registration in Namibia |
.alt.na, .cc.na, .co.na, .com.na, .edu.na, .info.na, .net.na, .org.na, .school.na |
Second level domains available for registration in Nauru |
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Second level domains available for registration in Nepal |
.aero.np, .asia.np, .biz.np, .com.np, .coop.np, .info.np, .mil.np, .mobi.np, .museum.np, .name.np, .net.np, .org.np, .pro.np, .travel.np |
Second level domains available for registration in the Netherlands |
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Second level domains available for registration in New Zealand |
.ac.nz, .co.nz, .geek.nz, .gen.nz, .health.nz, .iwi.nz, .kiwi.nz, .maori.nz, .net.nz, .org.nz, .school.nz |
Second level domains available for registration in Nicaragua |
.ac.ni, .biz.ni, .co.ni, .com.ni, .edu.ni, .gob.ni, .in.ni, .info.ni, .int.ni, .mil.ni, .net.ni, .nom.ni, .org.ni, .web.ni |
Second level domains available for registration in Niger |
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Second level domains available for registration in Nigeria |
.com.ng, .edu.ng, .gov.ng, .i.ng, .mobi.ng, .name.ng, .net.ng, .org.ng, .sch.ng |
Second level domains available for registration in Niue |
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Second level domains available for registration in Norfolk Island |
.arts.nf, .com.nf, .firm.nf, .info.nf, .net.nf, .org.nf, .other.nf, .per.nf, .rec.nf, .store.nf, .web.nf |
Second level domains available for registration in North Macedonia |
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Second level domains available for registration in Norway |
.co.no, .fhs.no, .folkebibl.no, .fylkesbibl.no, .gs.no, .idrett.no, .museum.no, .priv.no, .uenorge.no, .vgs.no |
Second level domains available for registration in Oman |
.biz.om, .co.om, .com.om, .edu.om, .gov.om, .med.om, .mil.om, .museum.om, .net.om, .org.om, .pro.om, .sch.om |
Second level domains available for registration in Pakistan |
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Second level domains available for registration in Palestine |
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Second level domains available for registration in Panama |
.abo.pa, .com.pa, .edu.pa, .gob.pa, .ing.pa, .med.pa, .net.pa, .nom.pa, .org.pa, .sld.pa |
Second level domains available for registration in Papua New Guinea |
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Second level domains available for registration in Paraguay |
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Second level domains available for registration in Peru |
.com.pe, .edu.pe, .gob.pe, .mil.pe, .net.pe, .nom.pe, .org.pe |
Second level domains available for registration in the Philippines |
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Second level domains available for registration in Pitcairn Islands |
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Second level domains available for registration in Poland |
.agro.pl, .aid.pl, .atm.pl, .augustow.pl, .auto.pl, .babia-gora.pl, .bedzin.pl, .beskidy.pl, .bialowieza.pl, .bialystok.pl, .bielawa.pl, .bieszczady.pl, .biz.pl, .boleslawiec.pl, .bydgoszcz.pl, .bytom.pl, .cieszyn.pl, .com.pl, .czeladz.pl, .czest.pl, .dlugoleka.pl, .edu.pl, .elblag.pl, .elk.pl, .glogow.pl, .gmina.pl, .gniezno.pl, .gorlice.pl, .grajewo.pl, .gsm.pl, .ilawa.pl, .info.pl, .jaworzno.pl, .jelenia-gora.pl, .jgora.pl, .kalisz.pl, .karpacz.pl, .kartuzy.pl, .kaszuby.pl, .katowice.pl, .kazimierz-dolny.pl, .kepno.pl, .ketrzyn.pl, .klodzko.pl, .kobierzyce.pl, .kolobrzeg.pl, .konin.pl, .konskowola.pl, .kutno.pl, .lapy.pl, .lebork.pl, .legnica.pl, .lezajsk.pl, .limanowa.pl, .lomza.pl, .lowicz.pl, .lubin.pl, .lukow.pl, .mail.pl, .malbork.pl, .malopolska.pl, .mazowsze.pl, .mazury.pl, .media.pl, .miasta.pl, .mielec.pl, .mielno.pl, .mil.pl, .mragowo.pl, .naklo.pl, .net.pl, .nieruchomosci.pl, .nom.pl, .nowaruda.pl, .nysa.pl, .olawa.pl, .olecko.pl, .olkusz.pl, .olsztyn.pl, .opoczno.pl, .opole.pl, .org.pl, .ostroda.pl, .ostroleka.pl, .ostrowiec.pl, .ostrowwlkp.pl, .pc.pl, .pila.pl, .pisz.pl, .podhale.pl, .podlasie.pl, .polkowice.pl, .pomorskie.pl, .pomorze.pl, .powiat.pl, .priv.pl, .prochowice.pl, .pruszkow.pl, .przeworsk.pl, .pulawy.pl, .radom.pl, .rawa-maz.pl, .realestate.pl, .rel.pl, .rybnik.pl, .rzeszow.pl, .sanok.pl, .sejny.pl, .sex.pl, .shop.pl, .sklep.pl, .skoczow.pl, .slask.pl, .slupsk.pl, .sos.pl, .sosnowiec.pl, .stalowa-wola.pl, .starachowice.pl, .stargard.pl, .suwalki.pl, .swidnica.pl, .swiebodzin.pl, .swinoujscie.pl, .szczecin.pl, .szczytno.pl, .szkola.pl, .targi.pl, .tarnobrzeg.pl, .tgory.pl, .tm.pl, .tourism.pl, .travel.pl, .turek.pl, .turystyka.pl, .tychy.pl, .ustka.pl, .walbrzych.pl, .warmia.pl, .warszawa.pl, .waw.pl, .wegrow.pl, .wielun.pl, .wlocl.pl, .wloclawek.pl, .wodzislaw.pl, .wolomin.pl, .wroclaw.pl, .zachpomor.pl, .zagan.pl, .zarow.pl, .zgora.pl, .zgorzelec.pl |
Second level domains available for registration in Portugal |
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Second level domains available for registration in Puerto Rico |
.at.pr, .biz.pr, .ch.pr, .com.pr, .de.pr, .eu.pr, .fr.pr, .info.pr, .isla.pr, .it.pr, .name.pr, .net.pr, .nl.pr, .org.pr, .pro.pr, .uk.pr |
Second level domains available for registration in Qatar |
.com.qa, .edu.qa, .mil.qa, .name.qa, .net.qa, .org.qa, .sch.qa |
Second level domains available for registration in Romania |
.arts.ro, .co.ro, .com.ro, .firm.ro, .info.ro, .ne.ro, .nom.ro, .nt.ro, .or.ro, .org.ro, .rec.ro, .sa.ro, .srl.ro, .store.ro, .tm.ro, .www.ro |
Second level domains available for registration in Russia |
.adygeya.ru, .bashkiria.ru, .bir.ru, .cbg.ru, .com.ru, .dagestan.ru, .grozny.ru, .kalmykia.ru, .kustanai.ru, .marine.ru, .mordovia.ru, .msk.ru, .mytis.ru, .nalchik.ru, .net.ru, .nov.ru, .org.ru, .pp.ru, .pyatigorsk.ru, .spb.ru, .vladikavkaz.ru, .vladimir.ru, .ком.рф, .нет.рф, .орг.рф |
Second level domains available for registration in Rwanda |
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Second level domains available for registration in Saint Kitts and Nevis |
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Second level domains available for registration in Saint Lucia |
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Second level domains available for registration in Saint Vincent and the Grenadines |
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Second level domains available for registration in Samoa |
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Second level domains available for registration in Saudi Arabia |
.com.sa, .edu.sa, .med.sa, .net.sa, .org.sa, .pub.sa, .sch.sa |
Second level domains available for registration in Senegal |
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Second level domains available for registration in Serbia |
.co.rs, .edu.rs, .in.rs, .org.rs, .ак.срб, .пр.срб, .упр.срб |
Second level domains available for registration in the Seychelles |
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Second level domains available for registration in Sierra Leone |
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Second level domains available for registration in Singapore |
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Second level domains available for registration in Slovakia |
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Second level domains available for registration in Slovenia |
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Second level domains available for registration in the Solomon Islands |
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Second level domains available for registration in Somalia |
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Second level domains available for registration in South Africa |
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Second level domains available for registration in South Korea |
.co.kr, .go.kr, .ms.kr, .ne.kr, .or.kr, .pe.kr, .re.kr, .seoul.kr |
Second level domains available for registration in South Sudan |
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Second level domains available for registration in Soviet Union (former) |
.abkhazia.su, .adygeya.su, .aktyubinsk.su, .arkhangelsk.su, .armenia.su, .ashgabad.su, .azerbaijan.su, .balashov.su, .bashkiria.su, .bryansk.su, .bukhara.su, .chimkent.su, .dagestan.su, .east-kazakhstan.su, .exnet.su, .georgia.su, .grozny.su, .ivanovo.su, .jambyl.su, .kalmykia.su, .kaluga.su, .karacol.su, .karaganda.su, .karelia.su, .khakassia.su, .krasnodar.su, .kurgan.su, .kustanai.su, .lenug.su, .mangyshlak.su, .mordovia.su, .msk.su, .murmansk.su, .nalchik.su, .navoi.su, .north-kazakhstan.su, .nov.su, .obninsk.su, .penza.su, .pokrovsk.su, .sochi.su, .spb.su, .tashkent.su, .termez.su, .togliatti.su, .troitsk.su, .tselinograd.su, .tula.su, .tuva.su, .vladikavkaz.su, .vladimir.su, .vologda.su |
Second level domains available for registration in Spain |
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Second level domains available for registration in Sri Lanka |
.assn.lk, .com.lk, .edu.lk, .grp.lk, .hotel.lk, .ltd.lk, .ngo.lk, .org.lk, .soc.lk, .web.lk |
Second level domains available for registration in Sudan |
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Second level domains available for registration in Sweden |
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Second level domains available for registration in Syria |
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Second level domains available for registration in Taiwan |
.club.tw, .com.tw, .ebiz.tw, .game.tw, .idv.tw, .mil.tw, .net.tw, .org.tw |
Second level domains available for registration in Tajikistan |
.ac.tj, .aero.tj, .biz.tj, .co.tj, .com.tj, .coop.tj, .dyn.tj, .go.tj, .info.tj, .int.tj, .mil.tj, .museum.tj, .my.tj, .name.tj, .net.tj, .org.tj, .per.tj, .pro.tj, .web.tj |
Second level domains available for registration in Tanzania |
.ac.tz, .co.tz, .go.tz, .hotel.tz, .info.tz, .me.tz, .mil.tz, .mobi.tz, .ne.tz, .or.tz, .sc.tz, .tv.tz |
Second level domains available for registration in Thailand |
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Second level domains available for registration in Timor-Leste |
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Second level domains available for registration in Trinidad and Tobago |
.biz.tt, .co.tt, .com.tt, .info.tt, .jobs.tt, .mobi.tt, .name.tt, .net.tt, .org.tt, .pro.tt |
Second level domains available for registration in Tunisia |
.agrinet.tn, .com.tn, .defense.tn, .edunet.tn, .ens.tn, .fin.tn, .ind.tn, .info.tn, .intl.tn, .nat.tn, .net.tn, .org.tn, .perso.tn, .rnrt.tn, .rns.tn, .rnu.tn, .tourism.tn |
Second level domains available for registration in Turkey |
.av.tr, .bbs.tr, .biz.tr, .com.tr, .dr.tr, .gen.tr, .info.tr, .name.tr, .net.tr, .org.tr, .tel.tr, .tv.tr, .web.tr |
Second level domains available for registration in the Turks and Caicos Islands |
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Second level domains available for registration in the U.S. Virgin Islands |
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Second level domains available for registration in Uganda |
.ac.ug, .co.ug, .com.ug, .go.ug, .ne.ug, .or.ug, .org.ug, .sc.ug |
Second level domains available for registration in Ukraine |
.biz.ua, .cherkassy.ua, .cherkasy.ua, .chernigov.ua, .chernivtsi.ua, .chernovtsy.ua, .ck.ua, .cn.ua, .co.ua, .com.ua, .crimea.ua, .cv.ua, .dn.ua, .dnepropetrovsk.ua, .dnipropetrovsk.ua, .donetsk.ua, .dp.ua, .edu.ua, .gov.ua, .if.ua, .in.ua, .ivano-frankivsk.ua, .kh.ua, .kharkiv.ua, .kharkov.ua, .kherson.ua, .khmelnitskiy.ua, .kiev.ua, .kirovograd.ua, .km.ua, .kr.ua, .ks.ua, .kyiv.ua, .lg.ua, .lt.ua, .lugansk.ua, .lutsk.ua, .lviv.ua, .mk.ua, .net.ua, .nikolaev.ua, .od.ua, .odesa.ua, .odessa.ua, .org.ua, .pl.ua, .poltava.ua, .pp.ua, .rivne.ua, .rovno.ua, .rv.ua, .sebastopol.ua, .sm.ua, .sumy.ua, .te.ua, .ternopil.ua, .uz.ua, .uzhgorod.ua, .vinnica.ua, .vn.ua, .volyn.ua, .yalta.ua, .zaporizhzhe.ua, .zhitomir.ua, .zp.ua, .zt.ua |
Second level domains available for registration in the United Arab Emirates |
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Second level domains available for registration in the United Kingdom |
.ac.uk, .co.uk, .gov.uk, .ltd.uk, .me.uk, .net.uk, .org.uk, .plc.uk, .sch.uk |
Second level domains available for registration in Unknown (mz) |
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Second level domains available for registration in Uruguay |
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Second level domains available for registration in Uzbekistan |
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Second level domains available for registration in Vanuatu |
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Second level domains available for registration in Venezuela |
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Second level domains available for registration in Vietnam |
.ac.vn, .biz.vn, .com.vn, .edu.vn, .gov.vn, .health.vn, .info.vn, .int.vn, .name.vn, .net.vn, .org.vn, .pro.vn |
Second level domains available for registration in Yemen |
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Second level domains available for registration in Zambia |
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Second level domains available for registration in Zimbabwe |
SLD naming rules: what you can and cannot register
ICANN and RFC 1123 define the technical constraints that apply to every SLD registration:
- Length: Between one and 63 characters.
- Allowed characters: Letters (a-z), digits (0-9), and hyphens. Case-insensitive.
- Hyphens: Allowed in the middle, not at the start or end. The combination "--" in positions three and four is reserved for internationalized domain names (IDN).
- No spaces or other characters: Dots, underscores, and punctuation are not permitted.
- Numbers and special characters: Plain ASCII letters, digits, and hyphens are accepted almost everywhere, but a few registries go further. Numbers alone are fine almost everywhere (3663.com is a registered example), but some domain registrars apply extra scrutiny to all-numeric or two-letter SLDs in generic TLDs, since short strings like these are reserved in some namespaces to avoid confusion with country codes. Always check the specific registry's policy before assuming a special character or numeral will be accepted.
Internationalized domain names (IDNs) let registrants use non-Latin scripts, Cyrillic, Arabic, or Chinese characters, for instance, by encoding them into an ASCII-compatible Punycode label behind the scenes, which effectively extends the domain name structure beyond the standard Latin letters, digits, and hyphen.
Are diacritics accepter at the second level?
major gTLDs including .com, .net, .org, and .info accept characters like ñ, é, or ô at the second level, provided every character in that label comes from the same script (so ñ can't be mixed with, say, Cyrillic in a single name), and country-linked registries such as .es, .fr, and .ca support the accented letters their own languages use. Plenty of other registries have simply chosen not to enable this, .ai, for one, states outright that it does not currently offer IDN characters, so a label containing ñ or ô would be rejected there.
How to choose and register a second-level domain
1. Availability check - The SLD you want may already be registered under your preferred TLD, .com is still worth checking first given its widespread adoption. TLD-list lets you check domain availability and compare prices across TLDs in one place. Use the "Search domain availability" field to check yours.
2. Brand and memorability - Choose a name that is short, easy to spell, easy to remember, and clearly connected to your brand or project, one that will represent your brand for years to come and stand out to potential customers. Hyphens are allowed under the naming rules, but they make a name harder to remember and tend to cause confusion when shared verbally.
3. Registration vs. renewal cost - The registration price is what you pay in year one. Many domain registrars offer promotional first-year rates that do not apply from year two onward. Always check the renewal cost before selecting a registrar.
Frequently asked questions
When talking about a top level domain, the part of the domain name you register is always the second level domain, however, as explained in detail in the article above, when talking about a mandatory second level domain extension that some country code top-level domains offer, when you register a domain name you are registering the third level domain, so technically, when choosing a domain name for one of these you are choosing the third level domain.
Yes, but indirectly. Search engines like Google don't rank a page higher simply because the SLD contains a keyword, algorithm updates over the past decade specifically targeted exact-match domains (EMDs) after a wave of them were abused for thin, over-optimized sites built only to rank, and Google has favored them less and less ever since. That said, the SLD still shapes outcomes on search engine results pages in subtler ways: spotting a familiar term in the domain while scanning results creates a subconscious signal of relevance that can lift click-through rate even without a direct ranking boost. Branded domain names work differently, a name that's unique and memorable builds recognition and repeat visits over time, and those engagement signals are things search engines do reward indirectly. Other domain-related factors matter more for search engine optimization than the SLD itself, particularly the extension you choose; see our guide to the best domain extensions for SEO for a full breakdown.
The SLD is the name you choose and register. The TLD is the extension (like .com or .org) managed by a registry. Together they form the core domain name (example.com), and once you've registered the domain, that combination is what shows up wherever it's referenced, in a browser bar, on business cards, or in search engine results pages.
A ccSLD is a second level added by a country-code registry to organize registrations by type. Examples include .co.uk (commercial), .ac.uk (academic), and .com.br (commercial in Brazil).
No, mandatory SLDs only exist for certain ccTLDs, like .com.br, .com.mx, .com.uk or .net.uk. In these cases the registerable domain name is the third-level domain. There isn't mandatory SLDs for GTLDs or sponsored top-level domains.
No. Once registered, an SLD cannot be edited. Changing it requires registering a new domain, migrating the website, updating all links, and setting up redirects from the old URL, which is why it pays to get the name right with your domain registrar the first time, before the domain becomes tied to your online presence.
About the Author:
TLD-list
Editor team
Small crew of builders who believe a great idea should not be held back by a bad domain deal. We know this space inside out, from obscure new extensions to the registrar tricks that quietly inflate your renewal. We put that knowledge to work so you can spend less time worrying about domains and more time building the thing that matters.
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