ARIN
North America
whois.arin.net
TOOLS
IP WHOIS lookup
WHOIS/RDAP for any IP or domain: org, ASN, CIDR, RIR, dates, and abuse contacts. Free, no account.Recent lookups
No recent lookups.
History stays in this browser. It is not sent to our servers.
Regional Internet Registries
How to read a WHOIS result
| Organization | The entity assigned the block. |
|---|---|
| CIDR | How large the block is, e.g. 8.8.8.0/24. |
| ASN | Autonomous system number used in BGP. |
| Network type | Allocation / assignment category. |
| RIR | Which regional registry manages the block. |
| Country | Registered country, not necessarily the egress city. |
| Dates | First registration and last change. |
| Abuse contact | Mailbox for spam or abuse reports. |
WHOIS vs geolocation
| IP WHOIS | IP geolocation | |
|---|---|---|
| Source | RIR WHOIS/RDAP | Commercial GeoIP |
| What you get | Org, ASN, CIDR, dates | City, ISP, lat/lon, timezone |
| Best for | Ownership, abuse, BGP | Location, localization, fraud hints |
Typical uses
Abuse reports
Find the abuse mailbox and hand the incident to the network owner.
Network research
Read ASN, CIDR, and dates to see how the block was assigned.
Security review
Tell hosting, VPN, and ordinary corporate space apart.
Ownership checks
Confirm who is on the RIR record before you rely on the address.
Help
FAQ
01What is IP WHOIS?＋
Public RIR registration: org, ASN, CIDR, dates, registry, and abuse mailbox, via ARIN, RIPE, APNIC, LACNIC, and AFRINIC RDAP.
02Can I look up a domain?＋
Yes. Domain objects can show registrar, status, and nameservers. Privacy protection hides contacts.
03How is this different from geolocation?＋
Geolocation answers “where, roughly”. WHOIS answers “who is registered for this block”.
04What is RDAP?＋
The structured replacement for WHOIS. JSON over HTTPS. This tool uses RDAP only.
05Does this expose my IP to the target?＋
The query is sent from our servers. The RIR sees our egress, not your browser.
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