Report for 401851

Name

COSD - County of San Diego, 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.

401851 COSD - County of San Diego, US

  Adjacency:     1  Upstream:     1  Downstream:     0
  Upstream Adjacent AS list
    AS7018          ATT-INTERNET4 - AT&T Enterprises, LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
18958 AS401851       ORIGIN  Originate:       3584 /20.19  Transit:          0 /0.00  COSD - County of San Diego, 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       %
 9399 AS401851      COSD - County of San Diego, US                    12      8      3      7      5  41.67%


  Prefix               AS Path                              Aggregation Suggestion
  170.213.2.0/23       4777 2497 7018 401851 + Announce - aggregate of 170.213.2.0/24 (4777 2497 7018 401851) and 170.213.3.0/24 (4777 2497 7018 401851)
  170.213.2.0/24       4777 2497 7018 401851 - Withdrawn - aggregated with 170.213.3.0/24 (4777 2497 7018 401851)
  170.213.3.0/24       4777 2497 7018 401851 - Withdrawn - aggregated with 170.213.2.0/24 (4777 2497 7018 401851)
  170.213.4.0/22       4777 2497 7018 401851 + Announce - aggregate of 170.213.4.0/23 (4777 2497 7018 401851) and 170.213.6.0/23 (4777 2497 7018 401851)
  170.213.4.0/24       4777 2497 7018 401851 - Withdrawn - aggregated with 170.213.5.0/24 (4777 2497 7018 401851)
  170.213.5.0/24       4777 2497 7018 401851 - Withdrawn - aggregated with 170.213.4.0/24 (4777 2497 7018 401851)
  170.213.6.0/24       4777 2497 7018 401851 - Withdrawn - aggregated with 170.213.7.0/24 (4777 2497 7018 401851)
  170.213.7.0/24       4777 2497 7018 401851 - Withdrawn - aggregated with 170.213.6.0/24 (4777 2497 7018 401851)
  170.213.18.0/23      4777 2497 7018 401851   
  170.213.22.0/23      4777 2497 7018 401851   
  170.213.131.0/24     4777 2497 7018 401851   
  170.213.132.0/23     4777 2497 7018 401851 + Announce - aggregate of 170.213.132.0/24 (4777 2497 7018 401851) and 170.213.133.0/24 (4777 2497 7018 401851)
  170.213.132.0/24     4777 2497 7018 401851 - Withdrawn - aggregated with 170.213.133.0/24 (4777 2497 7018 401851)
  170.213.133.0/24     4777 2497 7018 401851 - Withdrawn - aggregated with 170.213.132.0/24 (4777 2497 7018 401851)
  209.77.1.0/24        4777 2497 7018 401851   

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

AS401851   12 More Specifics   12 Total Advertisements   COSD - County of San Diego, US
    170.213.2.0/24                170.213.0.0/16
    170.213.3.0/24                170.213.0.0/16
    170.213.4.0/24                170.213.0.0/16
    170.213.5.0/24                170.213.0.0/16
    170.213.6.0/24                170.213.0.0/16
    170.213.7.0/24                170.213.0.0/16
    170.213.18.0/23               170.213.0.0/16
    170.213.22.0/23               170.213.0.0/16
    170.213.131.0/24              170.213.0.0/16
    170.213.132.0/24              170.213.0.0/16
    170.213.133.0/24              170.213.0.0/16
    209.77.1.0/24                 209.76.0.0/14

Whois Entry

whois: 402591

IANA has recorded AS401851 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS401851\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:       401851
             ASName:         COSD
             ASHandle:       AS401851
             RegDate:        2025-07-21
             Updated:        2025-07-21
             Ref:            https://rdap.arin.net/registry/autnum/401851
             
             
             OrgName:        County of San Diego
             OrgId:          NMD
             Address:        The County of San Diego
             Address:        County Technology Office
             Address:        1600 Pacific Highway Room 306F
             City:           San Diego
             StateProv:      CA
             PostalCode:     92101
             Country:        US
             RegDate:        1995-02-10
             Updated:        2025-06-27
             Ref:            https://rdap.arin.net/registry/entity/NMD
             
             
             OrgAbuseHandle: GENER99-ARIN
             OrgAbuseName:   General Contact 
             OrgAbusePhone:  +1-619-531-5570 
             OrgAbuseEmail:  david.lindsay@sdcounty.ca.gov
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/GENER99-ARIN
             
             OrgTechHandle: GENER99-ARIN
             OrgTechName:   General Contact 
             OrgTechPhone:  +1-619-531-5570 
             OrgTechEmail:  david.lindsay@sdcounty.ca.gov
             OrgTechRef:    https://rdap.arin.net/registry/entity/GENER99-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.
             #