Who holds an IP address: network name, range, organisation and country as registered
Runs in your browser. Only the lookup you start is sent to the domain's registry (RDAP); nothing else leaves your device. Updated on 25 Oct 2026.Every public IP address belongs to a block handed out by one of the five regional registries: ARIN, RIPE NCC, APNIC, LACNIC or AFRINIC. Enter an address and the page finds the right registry from IANA’s list and reads the block’s record: its name and range, the organisation holding it, the country it was registered in, and the abuse contact to write to about traffic from it.
Type the IP address, such as 8.8.8.8, in Domain name or IP address.
Press Look up; the page finds the right regional registry from the IANA list.
Read Network name, Range, Organisation and Country as registered.
Use the Abuse contact to report unwanted traffic from the address.
Enter a domain name or an IP address. The page reads IANA's public bootstrap list to find which registry answers for it, then asks that registry's RDAP server directly: Verisign for .com and .net, Public Interest Registry for .org, Nominet for .uk, ARIN or RIPE NCC for an address, and so on. RDAP is the HTTPS and JSON successor to the old port-43 WHOIS, and it is what ICANN now requires registries to run.
For an IP address you get the network's name and handle, its first and last address and CIDR, the organisation holding it, the country as registered, and the abuse contact.
Missing names are normal. Since GDPR, registries and registrars leave out the owner's name, address and email, and many list what they removed. A record with no registrant is not an error, and the page says so. For thin registries such as .com, a link to the registrar's own record is shown when the registry gives one.
The rest of the article, and all 6 questions about WHOIS Lookup, are on the WHOIS Lookup page.
Both return registration data. WHOIS is a plain-text protocol on port 43 with a different layout at every registry. RDAP, defined in RFC 9082 and 9083, answers over HTTPS in JSON with fixed field names and status words, and ICANN now requires it from generic registries. A browser can read RDAP directly.
Registries and registrars remove personal details such as the owner's name, email and address to comply with GDPR and ICANN's registration data policy. Many RDAP answers list exactly which fields were redacted. The registrar can still forward a message to the owner or disclose the data for a lawful request.
Yes. Enter the address and the page asks the regional registry that holds its block, such as ARIN or RIPE NCC. The record shows the network name, the address range, the organisation and country as registered, and the abuse contact. The registered country is not always where the address is used.
Two: data.iana.org, to read IANA's public list of registries, which is the same file for everyone, and then the one registry's RDAP server that answers for your domain or address. The name or address you type goes only to that registry. If the IANA list cannot be read, rdap.org is used to find it.
Still stuck? Ask about WHOIS Lookup and anybody who knows can answer. No account needed.
Same job, other tools: AS Number Lookup – Turn an AS number into the network name, registry and allocation date · CNAME Lookup – Check where a CNAME alias points and follow the chain to its final address · IP to ASN Lookup – Map an IP address to the ASN that announces it, with the BGP prefix · AAAA Record Lookup (IPv6) – Check whether a domain has an IPv6 address, and what it is.
On the related tools: Open Port Checker – See if a port forwarded on your router is reachable from the internet.