IP Lookup

How do I find out who owns an IP address?

Reviewed by Prabath Thalangama · Last updated October 23, 2026

Look up its registration in RDAP, the network (ASN) that announces it, and its reverse DNS name. This IP lookup does all three: RDAP via rdap.org for the registered network and country, Team Cymru's ASN service for the announcing network, and a PTR query for the host name.

The ASN and network owner are the reliable facts: they tell you which company or cloud provider operates the address. The RDAP country is where the block is registered, which is not always where the server physically is.

ASN lookup currently works for IPv4 only. For IPv6 addresses you still get RDAP and reverse DNS.

How do I look up an IP address?

Enter an IP address, or a host name to look up the first address it resolves to.
Read the ASN and RDAP network to see who operates it.
To report abuse, use the network owner's abuse contact from its RDAP record or the registry's website.

How to read the results

PTR: The reverse DNS name, if one is set. Missing PTR is reported as information.
ASN: Autonomous system number, the announced prefix, its country and registry (ARIN, RIPE, APNIC, LACNIC or AFRINIC), and the AS name.
RDAP: The registered network's handle, name, country and address range.

Common questions about IP lookup results

The country looks wrong

RDAP shows where the block is registered. Cloud and CDN providers announce the same blocks from many locations.

No ASN shown

The address is IPv6, or it isn't announced on the internet. Unannounced space can still be registered in RDAP.

Examples and command-line equivalents

The same lookups from the command line

dig +short -x 1.1.1.1
dig +short TXT 1.1.1.1.origin.asn.cymru.com
curl -s https://rdap.org/ip/1.1.1.1 | jq '.name, .country'

Frequently asked questions

How accurate is IP geolocation?

Country is usually right; city-level location is often wrong, especially for mobile, VPN and cloud addresses. This tool doesn't estimate a city: it shows the registered country and the operating network, which are the reliable facts.

What is an ASN?

An autonomous system number identifies a network that sets its own routing policy on the internet, such as an ISP, cloud provider or large company. Every publicly routed address is announced by at least one ASN.