IP Lookup
This free IP lookup shows who runs an IP address and where it roughly is. Enter an IPv4 address, an IPv6 address or a hostname and see the network (AS number, prefix and registry), the reverse DNS name, an approximate location and the registration record with its abuse contact.
The lookup runs in your browser, so we never see what you type and nothing is stored. Your browser contacts Cloudflare (cloudflare-dns.com) or Google (dns.google) for DNS answers, the registries' RDAP servers (found through data.iana.org) for registration data, and stat.ripe.net (RIPEstat) for location. "Use my IP" asks ip46.tpc-hosting.net, our own server, which only answers with the address it sees.
Free, no signup.
What this IP lookup shows
You get four cards. The summary names the address and who it is registered to. The network card shows the AS number and name, the network prefix the address belongs to, the registry that handed it out, when it was allocated, the country it was registered in and its reverse DNS name if it has one.
The location card gives an approximate country and city. The registration card is the record from the regional internet registry (RDAP): the network name and handle, the address range, the organisation, the abuse contact and the dates it was registered and last changed. Three links below take you on to a reverse DNS check, the network behind the address and a blacklist check.
Where the data comes from
Your browser asks the sources directly, and we do not see what you look up. Hostnames and reverse DNS names are resolved through DNS over HTTPS from Cloudflare (cloudflare-dns.com), with Google (dns.google) as a fallback. The AS number, prefix, registry and allocation date come from Team Cymru's IP-to-ASN service, read over the same DNS connection.
The registration record comes from the RDAP server of the regional internet registry that owns the address block, found through the lists at data.iana.org. The approximate location comes from RIPEstat (stat.ripe.net), which serves GeoLite2 data from MaxMind. The Use my IP button asks ip46.tpc-hosting.net, our own server, which only answers with the address it sees.
How accurate is IP location?
Not very, and it is worth knowing why. An IP address does not carry a location. Databases guess one from registration data, routing and measurements, and they are usually right about the country and often wrong about the city. Mobile networks, VPNs, company networks and satellite links can all show up far from where the person really is.
Anycast networks announce the same address from many places at once, so a single location makes no sense, and the card says the location is unknown. The registered country on the network card is a different thing: it is where the block was registered, not where the server sits.
Hostnames, private addresses and IPv6
If you enter a hostname, the lookup finds its IPv4 and IPv6 addresses and shows them as buttons. The first one is looked up straight away, and a click on another one looks that one up. A site behind a content delivery network often shows the network's addresses rather than the server behind it.
Private addresses, such as 192.168.1.10, loopback addresses and other reserved ranges are not on the public internet, so there is nothing to look up. The page tells you what kind of address it is and stops there. IPv6 addresses work the same way as IPv4 ones, including the compressed forms.
What to do with the result
Use the abuse contact when you need to report spam, attacks or a hacked server on that network. Use the network card to see whether an address belongs to a hosting company, a mobile carrier or a home internet provider. If you are chasing a mail problem, the blacklist link checks the address on public blocklists.
If you run your own server, a reverse DNS name that matches your mail server's name helps mail get delivered. The link to the reverse DNS tool shows what the address resolves back to.
Frequently asked questions
What is an IP lookup?
An IP lookup finds the public information behind an IP address: which network and organisation it belongs to, the registry record, the reverse DNS name and an approximate location. It does not tell you who is using the address or their exact position.
Can I find someone's exact location from their IP?
No. IP location is approximate and often only right about the country. Providers share addresses between many customers, and VPNs and mobile networks move them around. The lookup shows the best guess from a public database, not a street address.
Why does the location say unknown?
Some addresses have no useful location in the database. This is common for anycast networks, where the same address is served from many places around the world, like public DNS services. The network and registration cards still work.
What is an abuse contact?
It is the email address the network's owner publishes for reports of spam, attacks and other misuse. It comes from the registry record. Send the report to that address with the date, the time and the log lines that show the problem.
Why can't I look up 192.168.1.1?
Addresses like 192.168.x.x, 10.x.x.x and 172.16.x.x are private. They are used inside home and office networks and are not unique on the internet, so no registry holds a record for them. The page explains the range instead.
Do you store the addresses I look up?
No. The lookup runs in your browser and we do not receive what you enter. Your browser asks Cloudflare or Google for DNS answers, the registries' RDAP servers for the registration record and stat.ripe.net for the location, so those services can see the request. The Use my IP button asks ip46.tpc-hosting.net, which does not store it.
What do the AS number and prefix mean?
An AS (autonomous system) is a network run by one organisation, such as a hosting company or an internet provider, and it has a number like AS13335. The prefix is the block of addresses that network announces, written like 1.1.1.0/24. The AS number tells you who routes the address.
Why does a hostname show several addresses?
A site can publish several IPv4 and IPv6 addresses for load balancing or reliability. The lookup lists them all and starts with the first. Click another to see its details, which are often the same network.
Dig deeper
What Is My IP
Your public IP address as websites see it, with its approximate location and provider.
Show my IPWHOIS Lookup
Who a domain is registered with, when it was registered, when it expires and its nameservers, from the registry.
Look up WHOISBlacklist Check
Is your mail server or domain on a spam blocklist? See where you're listed and how to get removed.
Check blocklists