Report for 11891

Name

COSL-ASN-01 - City of San Leandro, 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.

11891 COSL-ASN-01 - City of San Leandro, 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
58808 AS11891        ORIGIN  Originate:        256 /24.00  Transit:          0 /0.00  COSL-ASN-01 - City of San Leandro, 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       %
32640 AS11891       COSL-ASN-01 - City of San Leandro, US              1      0      0      1      0   0.00%


  Prefix               AS Path                              Aggregation Suggestion
  12.21.101.0/24       4777 2497 7018 11891   

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

AS11891   1 More Specifics   1 Total Advertisements   COSL-ASN-01 - City of San Leandro, US
    12.21.101.0/24                12.0.0.0/8

Whois Entry

whois: 402603

IANA has recorded AS11891 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS11891\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:       11891
             ASName:         COSL-ASN-01
             ASHandle:       AS11891
             RegDate:        2024-04-01
             Updated:        2024-04-01
             Ref:            https://rdap.arin.net/registry/autnum/11891
             
             
             OrgName:        City of San Leandro
             OrgId:          CSL-533
             Address:        835 E 14th Street
             City:           San Leandro
             StateProv:      CA
             PostalCode:     94577
             Country:        US
             RegDate:        2016-08-19
             Updated:        2025-06-06
             Ref:            https://rdap.arin.net/registry/entity/CSL-533
             
             
             OrgAbuseHandle: SOUTH127-ARIN
             OrgAbuseName:   Southern, Keith 
             OrgAbusePhone:  +1-510-577-3339 
             OrgAbuseEmail:  ksouthern@sanleandro.org
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/SOUTH127-ARIN
             
             OrgTechHandle: RASHE18-ARIN
             OrgTechName:   Rashedi, Sharif 
             OrgTechPhone:  +1-510-387-9160 
             OrgTechEmail:  srashedi@sanleandro.org
             OrgTechRef:    https://rdap.arin.net/registry/entity/RASHE18-ARIN
             
             OrgTechHandle: YUNGJ4-ARIN
             OrgTechName:   Yung, Jesse 
             OrgTechPhone:  +1-510-577-3326 
             OrgTechEmail:  jyung@sanleandro.org
             OrgTechRef:    https://rdap.arin.net/registry/entity/YUNGJ4-ARIN
             
             OrgTechHandle: MCVIC5-ARIN
             OrgTechName:   McVicker, Tim 
             OrgTechPhone:  +1-510-577-3359 
             OrgTechEmail:  TMcVicker@sanleandro.org
             OrgTechRef:    https://rdap.arin.net/registry/entity/MCVIC5-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.
             #