21787 CERIDIAN, US
Adjacency: 3 Upstream: 3 Downstream: 0
Upstream Adjacent AS list
AS13335 CLOUDFLARENET, US
AS174 COGENT-174, US
AS6461 ZAYO-6461, US
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 19206 AS21787 ORIGIN Originate: 3328 /20.30 Transit: 0 /0.00 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 % 36149 AS21787 CERIDIAN, US 7 0 0 7 0 0.00% Prefix AS Path Aggregation Suggestion 170.153.96.0/22 2497 174 21787 170.153.97.0/24 3257 174 21787 170.153.98.0/24 2497 6461 21787 170.153.140.0/22 2497 174 21787 170.153.141.0/24 49788 174 21787 170.153.142.0/24 6939 6461 21787 170.153.144.0/24 57866 13335 21787
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS21787 26 More Specifics 27 Total Advertisements CERIDIAN, US
170.153.4.0/22 170.153.0.0/16
170.153.4.0/24 170.153.0.0/16
170.153.8.0/22 170.153.0.0/16
170.153.10.0/24 170.153.0.0/16
170.153.30.0/24 170.153.0.0/16
170.153.65.0/24 170.153.0.0/16
170.153.66.0/23 170.153.0.0/16
170.153.90.0/24 170.153.0.0/16
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
170.153.114.0/23 170.153.0.0/16
170.153.114.0/24 170.153.0.0/16
170.153.120.0/22 170.153.0.0/16
170.153.121.0/24 170.153.0.0/16
170.153.122.0/24 170.153.0.0/16
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
170.153.202.0/24 170.153.0.0/16
170.153.222.0/24 170.153.0.0/16
170.153.246.0/23 170.153.0.0/16
170.153.246.0/24 170.153.0.0/16
170.153.252.0/23 170.153.0.0/16
170.153.252.0/24 170.153.0.0/16
170.153.255.0/24 170.153.0.0/16
Prefixes added and withdrawn by this origin AS in the past 7 days.
+ 170.153.0.0/16 Announced
+ 170.153.4.0/22 Announced
+ 170.153.4.0/24 Announced
+ 170.153.8.0/22 Announced
+ 170.153.10.0/24 Announced
+ 170.153.30.0/24 Announced
+ 170.153.65.0/24 Announced
+ 170.153.66.0/23 Announced
+ 170.153.90.0/24 Announced
+ 170.153.114.0/23 Announced
+ 170.153.114.0/24 Announced
+ 170.153.120.0/22 Announced
+ 170.153.121.0/24 Announced
+ 170.153.122.0/24 Announced
+ 170.153.202.0/24 Announced
+ 170.153.222.0/24 Announced
+ 170.153.246.0/23 Announced
+ 170.153.246.0/24 Announced
+ 170.153.252.0/23 Announced
+ 170.153.252.0/24 Announced
+ 170.153.255.0/24 Announced
whois: 402603
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.
#