Report for 21589

Name

CSJ-INTERNET - City of San Jose, US

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 AS6447) 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.

21589 CSJ-INTERNET, US

  Adjacency:     3  Upstream:     3  Downstream:     0
  Upstream Adjacent AS list
    AS7018          ATT-INTERNET4, US
    AS3257          GTT-BACKBONE GTT, US
    AS6939          HURRICANE, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
9871  AS21589        ORIGIN  Originate:      10752 /18.61  Transit:          0 /0.00  CSJ-INTERNET, US

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       %
 7335 AS21589       CSJ-INTERNET, US                                  25     10      4     19      6  24.00%


  Prefix               AS Path                              Aggregation Suggestion
  156.39.0.0/22        3257 21589           + Announce - aggregate of 156.39.0.0/23 (3257 21589) and 156.39.2.0/23 (3257 21589)
  156.39.0.0/24        3257 21589           - Withdrawn - aggregated with 156.39.1.0/24 (3257 21589)
  156.39.1.0/24        3257 21589           - Withdrawn - aggregated with 156.39.0.0/24 (3257 21589)
  156.39.2.0/24        3257 21589           - Withdrawn - aggregated with 156.39.3.0/24 (3257 21589)
  156.39.3.0/24        3257 21589           - Withdrawn - aggregated with 156.39.2.0/24 (3257 21589)
  156.39.5.0/24        3257 21589             
  156.39.10.0/23       3257 21589           + Announce - aggregate of 156.39.10.0/24 (3257 21589) and 156.39.11.0/24 (3257 21589)
  156.39.10.0/24       3257 21589           - Withdrawn - aggregated with 156.39.11.0/24 (3257 21589)
  156.39.11.0/24       3257 21589           - Withdrawn - aggregated with 156.39.10.0/24 (3257 21589)
  156.39.12.0/24       3257 21589             
  156.39.13.0/24       6939 21589 21589 21589 21589 21589 21589   
  156.39.15.0/24       3257 21589             
  156.39.28.0/24       3257 21589             
  156.39.48.0/21       3257 21589             
  156.39.60.0/24       3257 21589             
  156.39.62.0/23       3257 21589           + Announce - aggregate of 156.39.62.0/24 (3257 21589) and 156.39.63.0/24 (3257 21589)
  156.39.62.0/24       3257 21589           - Withdrawn - aggregated with 156.39.63.0/24 (3257 21589)
  156.39.63.0/24       3257 21589           - Withdrawn - aggregated with 156.39.62.0/24 (3257 21589)
  156.39.64.0/22       3257 21589             
  156.39.68.0/23       3257 21589           + Announce - aggregate of 156.39.68.0/24 (3257 21589) and 156.39.69.0/24 (3257 21589)
  156.39.68.0/24       3257 21589           - Withdrawn - aggregated with 156.39.69.0/24 (3257 21589)
  156.39.69.0/24       3257 21589           - Withdrawn - aggregated with 156.39.68.0/24 (3257 21589)
  156.39.73.0/24       3257 21589             
  156.39.99.0/24       3257 21589             
  156.39.125.0/24      3257 21589             
  156.39.127.0/24      3257 21589             
  156.39.131.0/24      3257 21589             
  156.39.136.0/21      3257 21589             
  156.39.160.0/24      7018 21589             

Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.

AS21589   23 More Specifics   23 Total Advertisements   CSJ-INTERNET, US
    156.39.0.0/24                 156.39.0.0/16
    156.39.1.0/24                 156.39.0.0/16
    156.39.2.0/24                 156.39.0.0/16
    156.39.3.0/24                 156.39.0.0/16
    156.39.5.0/24                 156.39.0.0/16
    156.39.10.0/24                156.39.0.0/16
    156.39.11.0/24                156.39.0.0/16
    156.39.12.0/24                156.39.0.0/16
    156.39.13.0/24                156.39.0.0/16
    156.39.15.0/24                156.39.0.0/16
    156.39.28.0/24                156.39.0.0/16
    156.39.48.0/21                156.39.0.0/16
    156.39.60.0/24                156.39.0.0/16
    156.39.62.0/24                156.39.0.0/16
    156.39.63.0/24                156.39.0.0/16
    156.39.64.0/22                156.39.0.0/16
    156.39.68.0/24                156.39.0.0/16
    156.39.69.0/24                156.39.0.0/16
    156.39.73.0/24                156.39.0.0/16
    156.39.99.0/24                156.39.0.0/16
    156.39.125.0/24               156.39.0.0/16
    156.39.127.0/24               156.39.0.0/16
    156.39.128.0/18               156.39.0.0/16
    156.39.131.0/24               156.39.0.0/16

Prefixes added and withdrawn by this origin AS in the past 7 days.

    + 156.39.13.0/24              Announced
    + 156.39.128.0/18             Announced
    - 156.39.131.0/24             Withdrawn

Whois Entry

whois: 402603

IANA has recorded AS21589 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS21589\n             
             #
             # ARIN WHOIS data and services are subject to the Terms of Use
             # available at: https://www.arin.net/resources/registry/whois/tou/
             #
             # If you see inaccuracies in the results, please report at
             # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
             #
             # Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
             #
             
             
             ASNumber:       21589
             ASName:         CSJ-INTERNET
             ASHandle:       AS21589
             RegDate:        2012-10-04
             Updated:        2012-10-04
             Ref:            https://rdap.arin.net/registry/autnum/21589
             
             
             OrgName:        City of San Jose
             OrgId:          CSJ-1
             Address:        200 E. Santa Clara St.
             City:           San Jose
             StateProv:      CA
             PostalCode:     95113
             Country:        US
             RegDate:        1991-12-09
             Updated:        2019-05-21
             Ref:            https://rdap.arin.net/registry/entity/CSJ-1
             
             
             OrgAbuseHandle: DNSAD188-ARIN
             OrgAbuseName:   DNS Admins
             OrgAbusePhone:  +1-408-793-6809 
             OrgAbuseEmail:  NetworkGroup@sanjoseca.gov
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/DNSAD188-ARIN
             
             OrgTechHandle: DNSAD188-ARIN
             OrgTechName:   DNS Admins
             OrgTechPhone:  +1-408-793-6809 
             OrgTechEmail:  NetworkGroup@sanjoseca.gov
             OrgTechRef:    https://rdap.arin.net/registry/entity/DNSAD188-ARIN
             
             OrgTechHandle: CASTI255-ARIN
             OrgTechName:   Castillo, James 
             OrgTechPhone:  +1-408-793-6809 
             OrgTechEmail:  james.castillo@sanjoseca.gov
             OrgTechRef:    https://rdap.arin.net/registry/entity/CASTI255-ARIN
             
             
             #
             # ARIN WHOIS data and services are subject to the Terms of Use
             # available at: https://www.arin.net/resources/registry/whois/tou/
             #
             # If you see inaccuracies in the results, please report at
             # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
             #
             # Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
             #