Use the IP WHOIS utility to look up the assigned owner, abuse and technical contacts for an IP address or range.

About the IP WHOIS Lookup tool

All computers or servers on the Internet have an IP address. IP addresses are allocated to organisations in blocks of contiguous addresses, who then allocate ranges within their allocation to their customers.

You can perform a query known as "WHOIS" to identify which organisation an IP address is allocated to.

Use Cases

Use the IP WHOIS tool on Solid Tools for Developers to:

  • Identify which organisation is responsible for an IP address
  • Find out contacts to report abuse or technical problems with an IP address


Enter an IPv4 or IPv6 address in the "IP address" field.


The raw output from the WHOIS database will be displayed.

The following example shows a WHOIS lookup for 2a07:7800::155, an IPv6 address allocated to 20i - the company that hosts the server running Solid Tools for Developers.

% This is the RIPE Database query service.
% The objects are in RPSL format.
% The RIPE Database is subject to Terms and Conditions.
% See

% Note: this output has been filtered.
%       To receive output for a database update, use the "-B" flag.

% Information related to '2a07:7800::/29'

% Abuse contact for '2a07:7800::/29' is ''

inet6num:       2a07:7800::/29
netname:        UK-20I-20160509
country:        GB
org:            ORG-LA982-RIPE
admin-c:        LC11803-RIPE
tech-c:         LC11803-RIPE
status:         ALLOCATED-BY-RIR
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-20i
mnt-lower:      uk-20i-1-mnt
mnt-lower:      MNT-20i
mnt-routes:     uk-20i-1-mnt
mnt-routes:     N4-NOC
created:        2016-05-09T12:49:12Z
last-modified:  2016-09-15T16:31:43Z
source:         RIPE

organisation:   ORG-LA982-RIPE
org-name:       20i Limited
org-type:       LIR
address:        Laurel House
address:        NG21 0HJ
address:        Mansfield
address:        UNITED KINGDOM
phone:          +443333442720
admin-c:        LC11803-RIPE
tech-c:         LC11803-RIPE
abuse-c:        AR36293-RIPE
mnt-ref:        MNT-20i
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-20i
created:        2016-05-03T11:35:51Z
last-modified:  2018-09-19T13:36:39Z
source:         RIPE # Filtered

person:         Lloyd Cobb
address:        20i Limited
address:        Laurel House
address:        Mansfield
address:        NG21 0HJ
address:        UNITED KINGDOM
phone:          +443333442720
nic-hdl:        LC11803-RIPE
mnt-by:         MNT-20i
created:        2016-05-03T11:35:50Z
last-modified:  2018-09-21T09:16:22Z
source:         RIPE

% Information related to '2a07:7800::/29AS31727'

route6:         2a07:7800::/29
origin:         AS31727
mnt-by:         N4-NOC
created:        2016-11-10T15:36:39Z
last-modified:  2016-11-10T15:36:39Z
source:         RIPE
descr:          20i v6 Network

% This query was served by the RIPE Database Query Service version 1.92.6 (WAGYU)

What is an IP address?

An IP address is a unique "address" for any device that is connected to a network.

IP addresses currently come in two formats - known as IPv4 (the most common) and IPv6 (a newer standard for an ever-expanding Internet.)


IPv4 addresses are four groups of between 1 and 3 digits, separated by dots.

For example, the server that runs Solid Tools for Developers has the IPv4 address:


IPv6 addresses are longer than IPv4 and contain letters as well as numbers. IPv6 networks can accommodate a much larger number of devices than IPv4 networks and are growing in popularity.

For example, the server that runs Solid Tools for Developers has the IPv6 address:

Run the IP WHOIS Lookup tool