Find who is behind any IP address — ASN, network owner, hosting or carrier, geolocation, and reverse DNS — the classic "whose IP is this" lookup for triage.
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🎓Learn: IP intelligence
What is an ASN?▾
An Autonomous System Number identifies a network that announces routes on the internet (an ISP, cloud provider, or large company). Every public IP belongs to exactly one AS at a time — that’s how traffic knows where to go.
What is a BGP prefix?▾
The CIDR block (e.g. 8.8.8.0/24) that the owning AS advertises to its neighbours via BGP. It’s the actual unit of internet routing — your single IP is reachable because its whole prefix is announced.
Where does this data come from?▾
ASN, AS name, and prefix come from Team Cymru’s public DNS service; the registered network name, organization, and country come from RDAP (the successor to WHOIS). Reverse DNS is a normal PTR lookup. No paid geolocation database is used.
Why might geolocation look wrong?▾
Registry country is where the block was allocated, not necessarily where the server physically sits. Anycast IPs (like 1.1.1.1) answer from many cities at once, so a single “location” is inherently approximate.