Report for 21787

Name

CERIDIAN - CERIDIAN, 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.

21787 CERIDIAN - CERIDIAN, US

  Adjacency:     3  Upstream:     3  Downstream:     0
  Upstream Adjacent AS list
    AS13335         CLOUDFLARENET - Cloudflare, Inc., US
    AS6461          ZAYO-6461 - Zayo Bandwidth, US
    AS174           COGENT-174 - Cogent Communications, LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
19171 AS21787        ORIGIN  Originate:       3328 /20.30  Transit:          0 /0.00  CERIDIAN - CERIDIAN, 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       %
21677 AS21787       CERIDIAN - CERIDIAN, US                            7      1      0      6      1  14.29%


  Prefix               AS Path                              Aggregation Suggestion
  170.153.96.0/22      4777 2497 174 21787    
  170.153.97.0/24      4777 2497 174 21787  - Withdrawn - matching aggregate 170.153.96.0/22 4777 2497 174 21787
  170.153.98.0/24      4777 2497 6461 21787   
  170.153.140.0/22     4777 2497 174 21787    
  170.153.141.0/24     4777 2516 174 21787    
  170.153.142.0/24     4777 2497 6461 21787   
  170.153.144.0/24     4777 13335 21787       

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

AS21787   7 More Specifics   7 Total Advertisements   CERIDIAN - CERIDIAN, US
    170.153.96.0/22               170.153.0.0/16
    170.153.97.0/24               170.153.0.0/16
    170.153.98.0/24               170.153.0.0/16
    170.153.140.0/22              170.153.0.0/16
    170.153.141.0/24              170.153.0.0/16
    170.153.142.0/24              170.153.0.0/16
    170.153.144.0/24              170.153.0.0/16

Whois Entry

whois: 402332

IANA has recorded AS21787 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS21787\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:       21787
             ASName:         CERIDIAN
             ASHandle:       AS21787
             RegDate:        2001-06-20
             Updated:        2012-10-17
             Ref:            https://rdap.arin.net/registry/autnum/21787
             
             
             OrgName:        CERIDIAN
             OrgId:          CERIDI-3
             Address:        300 EMBASSY ROW
             City:           ATLANTA
             StateProv:      GA
             PostalCode:     30328
             Country:        US
             RegDate:        2001-06-20
             Updated:        2012-10-17
             Ref:            https://rdap.arin.net/registry/entity/CERIDI-3
             
             
             OrgAbuseHandle: CKN23-ARIN
             OrgAbuseName:   No, Contact Known
             OrgAbusePhone:  +1-800-555-1234 
             OrgAbuseEmail:  nobody@example.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/CKN23-ARIN
             
             OrgTechHandle: CKN23-ARIN
             OrgTechName:   No, Contact Known
             OrgTechPhone:  +1-800-555-1234 
             OrgTechEmail:  nobody@example.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/CKN23-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.
             #