Domain IP lookup: how to find the IP address of a website

The domain name system (DNS) makes this translation automatically every time a browser, app, or search engine crawler visits a website, but a manual lookup lets you see the result yourself. This guide covers what the lookup returns, how to run one with free tools or terminal commands, and when each type of lookup actually helps a builder or domain buyer.

What is a domain IP lookup?

It's the process of querying DNS to find the IPv4 and IPv6 addresses associated with a domain name. Every domain resolves to at least one IP address through an A record for IPv4, and optionally a second type, AAAA, for IPv6. When you type a URL into your browser, your device performs this lookup automatically, in the background, before it can connect to the web server behind the site over the internet.

It's worth distinguishing this from a WHOIS lookup, since the two return completely different information. WHOIS pulls ownership details from the registry database: who owns the domain, when it expires, which ICANN-accredited registrar manages it, and the owner's contact information, unless a privacy service masks it. The IP answer tells you where the site actually lives rather than who owns the name.

What does a domain IP lookup tool return?

A lookup returns one or both of two record types, depending on what the site owner has set up.

A domain can resolve to more than one IP address at once. This is normal, and usually means the site uses load balancing across multiple machines, or sits behind a content delivery network (CDN) like Cloudflare or Fastly, both of which route each user request to a nearby edge location. Seeing several IPs in your lookup results isn't a sign anything is wrong. It's often a sign the site is set up for scale.

A and AAAA aren't the only DNS record types you'll come across, but they're the two that answer the question this lookup asks: where does this domain point right now? Others, like MX for mail or CNAME for aliases, answer different questions and won't show up in a standard result. If a query returns no A or AAAA answer at all, the zone usually isn't configured yet or the change hasn't propagated; it doesn't mean the domain doesn't exist.

How to check a website IP address

There are two practical ways to run a lookup, and both take under a minute.

Online tools such as this one

ree domain lookup tools like DNSChecker, MxToolbox, and nslookup.io let you type in a name, select the record type (A for IPv4, AAAA for IPv6), and read the answer directly in your browser. This is the faster option if you just need a quick answer and don't have terminal access. Before you paste unannounced names into any lookup service, read its privacy policy, since some log every query.

The command line

The nslookup and dig commands are available by default on Windows, macOS, and Linux, and give you the same data without leaving your terminal.

• Windows: nslookup example.com
• macOS / Linux: dig example.com A
• IPv6 lookup: dig example.com AAAA

Either method returns the same underlying answer. The command line is usually faster once you're used to it, and it's easier to script if you need to scan many names at once, for example when auditing an entire domain portfolio rather than a single site.

Whichever method you use, enter the domain on its own rather than a URL with a path attached. A query for example.com/blog will still resolve example.com. The path plays no part in name resolution, since routing to a specific page happens on the web server after the connection is made, not at the DNS layer.

What is a reverse IP lookup?

A reverse IP lookup works in the opposite direction: given an IP address, it returns the domain name, or names, mapped to it. This relies on a PTR entry, which points an address back to a hostname.

This is useful in two situations. First, it can reveal the canonical hostname behind a single IP, which helps when you only have an address from a log file or email header and need to confirm what it's actually serving. Second, it can list every site sharing that IP, since one machine on shared hosting commonly serves many unrelated sites at once. If you're researching a name before buying it, the neighbors on its IP are a useful signal: a cluster of spammy sites on the same address can be an SEO red flag.

When is a domain IP lookup useful?

The lookup earns its place in a few recurring situations, not just as a one-off curiosity.

• Verifying DNS propagation. After registering or transferring a domain, confirm the A record now points to your new IP before troubleshooting anything else. Changes typically propagate within a few hours, though they can take up to 48 hours depending on the time to live (TTL) set on the record, so a quick look tells you whether you're waiting on propagation or dealing with an actual configuration problem.
• Investigating a domain before buying. Look up the current IP to see the hosting provider and location, whether it shares an IP with other sites, and whether anything in its history raises questions worth asking the seller.
• Troubleshooting website downtime. Confirm the domain resolves to the IP you expect. A mismatch points to a configuration issue in your zone rather than a server-side problem, which changes where you should start debugging. If the IP is right, a ping shows whether the machine responds at all.
• Security research. Cross-reference the IP with WHOIS and the hosting provider's abuse contacts to support an investigation into a suspicious domain or phishing website, and to verify who actually controls it, separate from what its registration claims.

Once you've confirmed the setup is sound, compare domain registration and renewal prices across 100+ registrars on TLD-list before you buy or transfer it.

Ready to buy a domain? Compare domain prices on TLD-list and review renewal costs before you commit.

Frequently asked questions

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.