IP Whois Lookup

Classic WHOIS-style network registration data for any IP — the block owner, allocation dates, and registrant/admin/abuse contacts — via RDAP, the modern structured successor to legacy WHOIS text.

Enter an IP address above and press Look up.

Every IP address block is registered to an organization through one of five Regional Internet Registries (ARIN, RIPE, APNIC, LACNIC, AFRINIC). This tool queries that registry directly via RDAP (Registration Data Access Protocol) — structured JSON, not scraped WHOIS text — for the network range, registration dates, and every contact the registry has on file.

What you get

Network block
The CIDR range or address span this IP falls within, its registry handle, and allocation type (e.g. direct allocation vs. reassigned).
Dates
When the block was registered and when its record was last updated.
Contacts
Registrant, administrative, technical, and abuse contacts, with name and email where the registry publishes one.

How this differs from IP to Company

This shows the underlying registration record as-is. IP to Company takes this same registrant data and reconciles it against the IP's ASN organization name into one confidence-scored answer — useful when you want a single "who owns this" verdict rather than the raw record.

FAQ

RDAP is the modern, structured JSON successor to legacy WHOIS text, standardized specifically to replace it — every RIR now serves RDAP, so there's no need to parse unstructured text with a per-registry regex.
Yes — both IPv4 and IPv6 addresses are supported. The lookup is routed to the right Regional Internet Registry automatically from IANA's RDAP bootstrap data.
Registries don't all populate the same fields — e.g. country is often blank for ARIN-region records unlike APNIC's. Every field here reflects exactly what the registry published, never a filled-in guess.
This page shows the raw RDAP registration record — network block, allocation type, dates, and every contact on file. IP to Company instead reconciles that registrant against the ASN's organisation name into one verdict with a confidence label.

About this tool

The IP whois lookup returns the registration record for an address: the network block it belongs to, registration dates and the registrant, administrative and abuse contacts that the registry publishes.

How it works

Data is retrieved via RDAP, the modern structured successor to the legacy WHOIS protocol, which means the fields are consistent and machine-readable and are fetched from the appropriate regional registry at the time of your search.

What to keep in mind

Registries redact personal data and many records show an organization or a role mailbox instead of a person. The contact shown is the one on file, which may be out of date.

Common uses

It is the standard first step when handling abuse reports, since the abuse contact tells you where to send them, and it also helps to establish who allocated a block and when.

Related: IP to company lookup · ASN lookup · IP abuse checker · IP lookup