Report for 51572

Name

CERULEAN, GB

AS Adjacency Report

In the context of this report "Upstream" indicates that there is an adjacent AS that lines between the BGP table collection point (in this case at AS2.0) and the specified AS. Similarly, "Downstream" refers to an adjacent AS that lies beyond the specified AS. This upstream / downstream categorisation is strictly a description relative topology, and should not be confused with provider / customer / peer inter-AS relationships.

51572 CERULEAN, GB

  Adjacency:     1  Upstream:     1  Downstream:     0
  Upstream Adjacent AS list
    AS25577         C4L-AS, GB

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
25211 AS51572        ORIGIN  Originate:       2048 /21.00  Transit:          0 /0.00  CERULEAN, GB

Aggregation Suggestions

        Filter: Aggregates, Specifics

This report does not take into account conditions local to each origin AS in terms of policy or traffic engineering requirements, so this is an approximate guideline as to aggregation possibilities.

 Rank AS            AS Name                                      Current  Wthdw  Aggte  Annce Redctn       %
47096 AS51572       CERULEAN, GB                                       1      0      0      1      0   0.00%


  Prefix               AS Path                              Aggregation Suggestion
  46.16.80.0/21        4608 7575 25577 51572   

Whois Entry

whois: 402332

IANA has recorded AS51572 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS51572\n             % This is the RIPE Database query service.
             % The objects are in RPSL format.
             %
             % The RIPE Database is subject to Terms and Conditions.
             % See https://docs.db.ripe.net/terms-conditions.html
             
             % Note: this output has been filtered.
             
             % Information related to 'AS51357 - AS51817'
             
             as-block:       AS51357 - AS51817
             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:        2025-02-13T13:57:44Z
             last-modified:  2025-02-13T13:57:44Z
             source:         RIPE
             
             % Information related to 'AS51572'
             
             % Abuse contact for 'AS51572' is 'abuse@cerulean.co.uk'
             
             aut-num:        AS51572
             as-name:        CERULEAN
             org:            ORG-CSL8-RIPE
             import:         from AS25577 accept ANY
             import:         from AS174 accept ANY
             export:         to AS25577 announce AS51572
             export:         to AS174 announce AS51572
             admin-c:        SP9246-RIPE
             tech-c:         SP9247-RIPE
             status:         ASSIGNED
             mnt-by:         RIPE-NCC-END-MNT
             mnt-by:         CERULEAN-MNTR
             created:        2010-09-30T10:13:37Z
             last-modified:  2025-10-24T17:33:19Z
             source:         RIPE # Filtered
             
             organisation:   ORG-CSL8-RIPE
             org-name:       Cerulean Solutions Limited
             country:        GB
             org-type:       LIR
             address:        120 Cockfosters Road
             address:        EN4 0DZ
             address:        Barnet
             address:        UNITED KINGDOM
             phone:          +443452306670
             reg-nr:         03852868
             mnt-ref:        CERULEAN-MNTR
             mnt-ref:        RIPE-NCC-HM-MNT
             mnt-by:         RIPE-NCC-HM-MNT
             mnt-by:         CERULEAN-MNTR
             abuse-c:        CSAC4-RIPE
             created:        2010-04-15T14:19:20Z
             last-modified:  2026-04-29T05:21:37Z
             source:         RIPE # Filtered
             
             %ERROR:201: access denied for 2401:2000:6660:0:0:0:0:13
             %
             % Queries from your IP address have passed the daily limit of controlled objects.
             % Access from your host has been temporarily denied.
             % For more information, see
             % https://docs.db.ripe.net/FAQ#why-did-i-receive-an-error-201-access-denied
             
             % This query was served by the RIPE Database Query Service version 1.122 (SHETLAND)