IP RDAP / ASN Lookup
Find out which network block, organisation and registry an IP address belongs to using RDAP — the authoritative, structured successor to WHOIS. Works for both IPv4 and IPv6.
About IP RDAP lookups
RDAP (Registration Data Access Protocol) is the modern system that Regional Internet Registries use to publish who owns a block of IP addresses. This tool sends your query to the public rdap.org bootstrap service, which forwards it to the right registry — ARIN, RIPE, APNIC, LACNIC or AFRINIC — and returns the network's registration record.
What the results show
- Range — the
startAddressandendAddress, or the CIDR block, covering the IP. - Network name & handle — the identifier the registry assigns to the allocation.
- Organisation — the entity that holds the block, from its registered contacts.
- Country & type — where it is registered and whether it is allocated, assigned, or direct.
- Status & events — registration and last-changed information, exactly as the registry reports it.
RDAP tells you where a network is registered, which is often an operator's head office — not where the address is actually used. For an estimate of a device's location, reach for a geolocation tool instead.
Nothing on this page is hardcoded: every field is pulled live from the registry when you search, and you can expand the raw JSON panel to inspect the complete response. To understand how these networks announce their routes across the internet, read what an ASN is. To look up the registration behind a domain name instead of an IP, use the Domain RDAP Lookup.
Frequently asked questions
What does an IP RDAP lookup tell me?
It shows which registered network block an IP belongs to: the start and end addresses or CIDR, the network name, the owning organisation, the country, and the Regional Internet Registry that allocated it. This is the authoritative ownership record, not a geolocation guess.
Does RDAP show the exact ASN for an IP?
IP RDAP describes the network allocation and its owning organisation, and often references the operator, but the autonomous system number itself is registered separately. Use the network name and organisation shown here alongside a routing lookup to confirm the ASN.
Does this work for both IPv4 and IPv6?
Yes. Enter any public IPv4 or IPv6 address and the rdap.org bootstrap service routes the query to the correct Regional Internet Registry (ARIN, RIPE, APNIC, LACNIC or AFRINIC).
Why is the location different from a geolocation tool?
RDAP reports where the network is registered, which can be the operator's headquarters rather than where the address is physically used. For an estimate of the user's location, use an IP geolocation tool instead.
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