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IP WHOIS Lookup – Find Who Owns an IP Address

Find the organization behind an IP address, its network range, AS number and abuse contact.

About IP WHOIS Lookup

Run an IP WHOIS lookup when an address shows up and you need to know whose it is, such as an IP hammering your login page, an unfamiliar crawler in the access log, the sending server in a suspicious email header, or a site whose hosting company you're curious about. Enter an IP address, or a domain, which is looked up by its first address, and click Look up.

The record comes over RDAP from the regional registry in charge of the address, whether ARIN, RIPE NCC, APNIC, LACNIC or AFRINIC. You see the network name, organization, country, address range and CIDR, handle, allocation type, postal address, abuse email and the created and updated dates, plus the origin AS number and name, the BGP prefix and the reverse DNS name. Click the AS number to open ASN Lookup. For cloud and hosting addresses the owner is normally the provider, not its customer. Private and reserved addresses such as 192.168.x.x are refused because they have no public owner. The raw RDAP answer is included, and nothing is stored.

How to use IP WHOIS Lookup

  1. 1
    Enter an IP or domain

    Paste an IPv4 or IPv6 address, or a domain to look up the address it points to.

  2. 2
    Click Look up

    The IP WHOIS lookup asks the regional registry that manages the address.

  3. 3
    Read the owner details

    Check the organization, range, country and abuse email, and click the AS number for more.

  4. 4
    Keep the record

    Copy what you need, or use Download JSON to save the full result.

Why use Cubfile for this

  • All five registries

    ARIN, RIPE NCC, APNIC, LACNIC and AFRINIC, picked automatically for each address.

  • Routing details

    Origin AS number and name plus the BGP prefix, from Team Cymru's IP-to-ASN data.

  • Abuse contact

    The email the network publishes for spam, scanning and attack reports.

  • Raw RDAP answer

    The registry's original JSON next to the readable summary.

FAQ

IP WHOIS Lookup: questions and answers

What's the difference between IP WHOIS and domain WHOIS?
IP WHOIS shows who holds a block of IP addresses, as recorded by the regional internet registries. Domain WHOIS shows who registered a domain name and when it expires, which WHOIS Lookup in the Domain & DNS tools covers.
How do I report abuse from an IP address?
Look up the IP and send your report to the abuse email shown, with log lines, times and your time zone. It's the address the network owner publishes for complaints about spam, scanning and attacks.
Why does the IP belong to a cloud company instead of the website?
Most sites run on rented servers, so the address block is registered to the hosting or cloud provider. The customer using a single address usually isn't listed.
Why is my IP address refused?
Private and reserved addresses, such as 10.x.x.x, 172.16.x.x to 172.31.x.x, 192.168.x.x and 127.0.0.1, only exist inside local networks, so no registry lists an owner for them.
Is the IP WHOIS lookup free?
Yes. It needs no sign-up and doesn't use your daily tasks, though each visitor has an hourly allowance that's higher for members and VIP. Lookups aren't stored.
Share IP WHOIS Lookup with a friendIt runs in any browser, and they can try it without signing up.

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