About the AS Network WHOIS Lookup tool

Network packets (traffic) are transmitted over the Internet by traversing multiple networks run by different organisations - known as Autonomous Networks. Each of these organisations is assigned a number for their network, known as an ASN (Autonomous System Number.)

Each network peers with other networks, sharing the AS numbers of the networks they peer with.

You can perform a query known as "WHOIS" to identify which organisation operates a particular AS network.

Use Cases

Use the AS Network WHOIS tool on Solid Tools for Developers to:

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


Enter an ASN in the "AS Number" field.


The raw output from the WHOIS database will be displayed.

The following example shows a WHOIS lookup for AS50957, the AS number allocated to Memset - 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 http://www.ripe.net/db/support/db-terms-conditions.pdf

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

% Information related to 'AS47104 - AS52223'

as-block:       AS47104 - AS52223
descr:          RIPE NCC ASN block
remarks:        These AS Numbers are assigned to network operators in the RIPE NCC service region.
mnt-by:         RIPE-NCC-HM-MNT
created:        2015-09-30T14:19:22Z
last-modified:  2015-09-30T14:19:22Z
source:         RIPE

% Information related to 'AS50957'

% Abuse contact for 'AS50957' is 'abuse@memset.com'

aut-num:        AS50957
as-name:        MEMSET
org:            ORG-ML145-RIPE
remarks:        Transits:
import:         from AS174 accept any
import:         from AS6939 accept any
import:         from AS60610 accept any
export:         to AS174 announce AS-MEMSET
export:         to AS6939 announce AS-MEMSET
export:         to AS60610 announce AS-MEMSET
remarks:        Memset Peers at:
remarks:        LINX LON1, London, UK
remarks:        LINX LON2, London, UK
remarks:        LONAP, London, UK
remarks:        see https://www.peeringdb.com/asn/50957
admin-c:        MN5194-RIPE
tech-c:         MN5194-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         MEMSET
mnt-routes:     MEMSET
created:        2011-02-14T12:12:46Z
last-modified:  2017-12-04T15:51:15Z
source:         RIPE

organisation:   ORG-ML145-RIPE
org-name:       MEMSET Ltd
org-type:       LIR
address:        Building 87 Dunsfold Park
address:        GU6 8TB
address:        Cranleigh
address:        UNITED KINGDOM
phone:          +441483608010
admin-c:        SML-RIPE
admin-c:        NCW2-RIPE
admin-c:        ACS80-RIPE
admin-c:        MN5194-RIPE
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        MEMSET
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MEMSET
abuse-c:        MA14533-RIPE
created:        2010-06-04T12:01:26Z
last-modified:  2016-10-21T07:31:54Z
source:         RIPE # Filtered

role:           MEMSET NOC
address:        Memset Ltd
address:        Building 87
address:        Dunsfold Park
address:        Stovolds Hill
address:        Cranleigh
address:        Surrey
address:        GU6 8TB
remarks:        ***************************************************
remarks:        *** SEND ALL ABUSE REPORTS TO abuse@memset.com  ***
remarks:        ***************************************************
abuse-mailbox:  abuse@memset.com
admin-c:        ACS80-RIPE
admin-c:        NCW2-RIPE
admin-c:        SML-RIPE
tech-c:         ACS80-RIPE
tech-c:         NCW2-RIPE
tech-c:         SML-RIPE
nic-hdl:        MN5194-RIPE
mnt-by:         MEMSET
created:        2010-09-27T16:26:05Z
last-modified:  2013-08-23T14:15:32Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.90 (HEREFORD)

Run the AS Network WHOIS Lookup tool