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 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.

21589 CSJ-INTERNET - City of San Jose, US

  Adjacency:     3  Upstream:     3  Downstream:     0
  Upstream Adjacent AS list
    AS7018          ATT-INTERNET4 - AT&T Enterprises, LLC, US
    AS3257          GTT-BACKBONE GTT, US
    AS6939          HURRICANE - Hurricane Electric LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
9840  AS21589        ORIGIN  Originate:      10752 /18.61  Transit:          0 /0.00  CSJ-INTERNET - City of San Jose, 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       %
 7258 AS21589       CSJ-INTERNET - City of San Jose, US               25     10      4     19      6  24.00%


  Prefix               AS Path                              Aggregation Suggestion
  156.39.0.0/22        4777 2516 3257 21589 + Announce - aggregate of 156.39.0.0/23 (4777 2516 3257 21589) and 156.39.2.0/23 (4777 2516 3257 21589)
  156.39.0.0/24        4777 2516 3257 21589 - Withdrawn - aggregated with 156.39.1.0/24 (4777 2516 3257 21589)
  156.39.1.0/24        4777 2516 3257 21589 - Withdrawn - aggregated with 156.39.0.0/24 (4777 2516 3257 21589)
  156.39.2.0/24        4777 2516 3257 21589 - Withdrawn - aggregated with 156.39.3.0/24 (4777 2516 3257 21589)
  156.39.3.0/24        4777 2516 3257 21589 - Withdrawn - aggregated with 156.39.2.0/24 (4777 2516 3257 21589)
  156.39.5.0/24        4777 2516 3257 21589   
  156.39.10.0/23       4777 2516 3257 21589 + Announce - aggregate of 156.39.10.0/24 (4777 2516 3257 21589) and 156.39.11.0/24 (4777 2516 3257 21589)
  156.39.10.0/24       4777 2516 3257 21589 - Withdrawn - aggregated with 156.39.11.0/24 (4777 2516 3257 21589)
  156.39.11.0/24       4777 2516 3257 21589 - Withdrawn - aggregated with 156.39.10.0/24 (4777 2516 3257 21589)
  156.39.12.0/24       4777 2516 3257 21589   
  156.39.13.0/24       4777 6939 21589 21589 21589 21589 21589 21589   
  156.39.15.0/24       4777 2516 3257 21589   
  156.39.28.0/24       4777 2516 3257 21589   
  156.39.48.0/21       4777 2516 3257 21589   
  156.39.60.0/24       4777 2516 3257 21589   
  156.39.62.0/23       4777 2516 3257 21589 + Announce - aggregate of 156.39.62.0/24 (4777 2516 3257 21589) and 156.39.63.0/24 (4777 2516 3257 21589)
  156.39.62.0/24       4777 2516 3257 21589 - Withdrawn - aggregated with 156.39.63.0/24 (4777 2516 3257 21589)
  156.39.63.0/24       4777 2516 3257 21589 - Withdrawn - aggregated with 156.39.62.0/24 (4777 2516 3257 21589)
  156.39.64.0/22       4777 2516 3257 21589   
  156.39.68.0/23       4777 2516 3257 21589 + Announce - aggregate of 156.39.68.0/24 (4777 2516 3257 21589) and 156.39.69.0/24 (4777 2516 3257 21589)
  156.39.68.0/24       4777 2516 3257 21589 - Withdrawn - aggregated with 156.39.69.0/24 (4777 2516 3257 21589)
  156.39.69.0/24       4777 2516 3257 21589 - Withdrawn - aggregated with 156.39.68.0/24 (4777 2516 3257 21589)
  156.39.73.0/24       4777 2516 3257 21589   
  156.39.99.0/24       4777 2516 3257 21589   
  156.39.125.0/24      4777 2516 3257 21589   
  156.39.127.0/24      4777 2516 3257 21589   
  156.39.131.0/24      4777 2516 3257 21589   
  156.39.136.0/21      4777 2516 3257 21589   
  156.39.160.0/24      4777 2497 7018 21589   

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

AS21589   25 More Specifics   25 Total Advertisements   CSJ-INTERNET - City of San Jose, 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
    156.39.131.0/24               156.39.0.0/16
    156.39.136.0/21               156.39.0.0/16
    156.39.160.0/24               156.39.0.0/16

Whois Entry

whois: 402332

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
             
             
             OrgTechHandle: DNSAD188-ARIN
             OrgTechName:   DNS Admins
             OrgTechPhone:  +1-408-793-6809 
             OrgTechEmail:  DNSAdmins@sanjoseca.gov
             OrgTechRef:    https://rdap.arin.net/registry/entity/DNSAD188-ARIN
             
             OrgAbuseHandle: DNSAD188-ARIN
             OrgAbuseName:   DNS Admins
             OrgAbusePhone:  +1-408-793-6809 
             OrgAbuseEmail:  DNSAdmins@sanjoseca.gov
             OrgAbuseRef:    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.
             #