Solid Dev Tools:AS Network Whois

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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.

Optionally select a regional WHOIS server to send your query to.


The raw output from the WHOIS database will be displayed.

The following example shows a WHOIS lookup for AS15418, the AS number allocated to Fasthosts - the data centre 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 'AS15400 - AS15474'

as-block:       AS15400 - AS15474
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:        2018-11-22T15:27:25Z
last-modified:  2018-11-22T15:27:25Z
source:         RIPE

% Information related to 'AS15418'

% Abuse contact for 'AS15418' is ''

aut-num:        AS15418
as-name:        FASTHOSTS-INTERNET
descr:          Fasthosts Internet Ltd. Gloucester, UK.
org:            ORG-FHL1-RIPE
admin-c:        FHUK-RIPE
tech-c:         FHUK-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         AS8560-MNT
mnt-by:         AS15418-MNT
created:        2002-06-18T12:26:34Z
last-modified:  2018-05-08T12:24:45Z
source:         RIPE # Filtered

organisation:   ORG-FHL1-RIPE
org-name:       Fasthosts Internet Limited
country:        GB
org-type:       LIR
address:        Discovery House
                154 Southgate Street
address:        GL1 2EX
address:        Gloucester
address:        UNITED KINGDOM
phone:          +443330142700
fax-no:         +441452541633
mnt-ref:        AS15418-MNT
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         AS15418-MNT
admin-c:        FHUK-RIPE
tech-c:         FHUK-RIPE
abuse-c:        FH4126-RIPE
created:        2004-04-17T12:14:35Z
last-modified:  2023-01-09T16:11:45Z
source:         RIPE # Filtered

role:           Fasthosts Networks UK
address:        Fasthosts Internet Limited
address:        Discovery House
address:        154 Southgate Street
address:        Gloucester, GL1 2EX
phone:          +44 1452 561874
nic-hdl:        FHUK-RIPE
remarks:        -----------------------------------------------
remarks:        Please report abuse to
remarks:        Abuse reports via other channels may be ignored
remarks:        -----------------------------------------------
org:            ORG-FHL1-RIPE
admin-c:        GD8691-RIPE
admin-c:        MM24449-RIPE
tech-c:         GD8691-RIPE
tech-c:         MM24449-RIPE
mnt-by:         AS15418-MNT
mnt-by:         AS8560-MNT
created:        2015-02-26T14:57:35Z
last-modified:  2019-01-28T10:09:16Z
source:         RIPE # Filtered

% This query was served by the RIPE Database Query Service version 1.109 (BUSA)