21508 CCCH-AS5 - Comcast Cable Communications Holdings, Inc
Adjacency: 2 Upstream: 2 Downstream: 0
Upstream Adjacent AS list
AS7922 DNEO-OSP3 - Comcast Cable Communications, Inc.
AS7018 ATT-INTERNET4 - AT&T WorldNet Services
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 264 AS21508 ORIGIN Originate: 1025024 /12.03 Transit: 0 /0.00 CCCH-AS5 - Comcast Cable Communications Holdings, Inc
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 % 1573 AS21508 CCCH-AS5 - Comcast Cable Communications 81 8 0 73 8 9.88% Prefix AS Path Aggregation Suggestion 24.30.224.0/19 4637 3491 3549 7922 21508 24.125.0.0/16 4637 3491 3549 7922 21508 24.125.0.0/18 4637 3491 3561 7018 21508 24.125.64.0/20 4637 3491 3549 7922 21508 - Withdrawn - matching aggregate 24.125.0.0/16 4637 3491 3549 7922 21508 24.125.80.0/20 4637 3491 3549 7922 21508 - Withdrawn - matching aggregate 24.125.0.0/16 4637 3491 3549 7922 21508 24.125.96.0/19 4637 3491 3561 7018 21508 24.125.128.0/20 4637 3491 3561 7018 21508 24.125.144.0/20 4637 3491 3549 7922 21508 - Withdrawn - matching aggregate 24.125.0.0/16 4637 3491 3549 7922 21508 24.125.160.0/20 4637 3491 3549 7922 21508 - Withdrawn - matching aggregate 24.125.0.0/16 4637 3491 3549 7922 21508 24.125.176.0/20 4637 3491 3549 7922 21508 - Withdrawn - matching aggregate 24.125.0.0/16 4637 3491 3549 7922 21508 24.125.192.0/19 4637 3491 3549 7922 21508 - Withdrawn - matching aggregate 24.125.0.0/16 4637 3491 3549 7922 21508 24.125.224.0/19 4637 3491 3549 7922 21508 - Withdrawn - matching aggregate 24.125.0.0/16 4637 3491 3549 7922 21508 24.127.0.0/17 4637 3491 3561 7018 21508 24.131.0.0/20 4637 3491 3549 7922 21508 65.97.0.0/19 4637 3491 3561 7018 21508 66.208.226.0/24 4637 3491 3561 7018 21508 67.163.96.0/19 4637 3491 3549 7922 21508 67.166.160.0/19 4637 3491 3561 7018 21508 67.172.192.0/19 4637 3491 3549 7922 21508 67.178.38.0/23 4637 3491 3561 7018 21508 21508 21508 21508 67.187.0.0/19 4637 3491 3561 7018 21508 68.57.32.0/19 4637 3491 3561 7018 21508 68.57.64.0/18 4637 3491 3549 7922 21508 68.57.128.0/18 4637 3491 3549 7922 21508 68.85.226.0/24 4637 3491 3561 7018 21508 68.86.14.0/24 4637 3491 3561 7018 21508 68.86.24.0/24 4637 3491 3561 7018 21508 68.86.124.0/22 4637 3491 3549 7922 21508 68.86.172.0/22 4637 3491 3549 7922 21508 69.240.240.0/23 4637 3491 3549 7922 21508 69.241.85.0/24 4637 3491 3549 7922 21508 69.243.208.0/20 4637 3491 3549 7922 21508 69.244.224.0/20 4637 3491 3561 7018 21508 69.252.18.0/23 4637 3491 3561 7018 21508 70.88.24.0/23 4637 3491 3561 7018 21508 70.88.168.0/23 4637 3491 3549 7922 21508 70.88.184.0/21 4637 3491 3549 7922 21508 70.88.188.0/22 4637 3491 3561 7018 21508 70.89.232.0/21 4637 3491 3549 7922 21508 70.91.162.0/24 4637 3491 3561 7018 21508 71.56.160.0/19 4637 3491 3549 7922 21508 71.57.208.0/20 4637 3491 3549 7922 21508 71.62.0.0/16 4637 3491 3549 7922 21508 71.63.0.0/17 4637 3491 3549 7922 21508 71.63.0.0/19 4637 3491 3549 7922 21508 - Withdrawn - matching aggregate 71.63.0.0/17 4637 3491 3549 7922 21508 71.63.32.0/19 4637 3491 3561 7018 21508 71.63.64.0/18 4637 3491 3561 7018 21508 71.197.0.0/20 4637 3491 3549 7922 21508 71.206.128.0/18 4637 3491 3561 7018 21508 71.207.128.0/19 4637 3491 3561 7018 21508 73.8.32.0/19 4637 3491 3561 7018 21508 21508 21508 21508 73.126.64.0/18 4637 3491 3561 7018 21508 21508 21508 21508 73.140.0.0/16 4637 3491 3561 7018 21508 21508 21508 21508 73.141.0.0/16 4637 3491 3561 7018 21508 73.142.0.0/17 4637 3491 3561 7018 21508 21508 21508 21508 73.198.176.0/20 4637 3491 3561 7018 21508 73.202.128.0/17 4637 3491 3561 7018 21508 73.207.0.0/16 4637 3491 3561 7018 21508 21508 21508 21508 73.232.0.0/15 4637 3491 3561 7018 21508 74.18.128.0/19 4637 3491 3561 7018 21508 74.22.32.0/20 4637 3491 3561 7018 21508 74.30.208.0/20 4637 3491 3561 7018 21508 74.30.240.0/20 4637 3491 3561 7018 21508 74.92.186.0/23 4637 3491 3549 7922 21508 74.92.255.0/24 4637 3491 3549 7922 21508 74.93.116.0/22 4637 3491 3549 7922 21508 74.94.208.0/21 4637 3491 3549 7922 21508 74.95.96.0/22 4637 3491 3561 7018 21508 21508 21508 21508 74.144.32.0/20 4637 3491 3561 7018 21508 74.146.176.0/20 4637 3491 3561 7018 21508 74.154.160.0/20 4637 3491 3549 7922 21508 74.154.240.0/20 4637 3491 3561 7018 21508 74.158.80.0/20 4637 3491 3561 7018 21508 75.75.0.0/17 4637 3491 3561 7018 21508 75.144.34.0/23 4637 3491 3549 7922 21508 76.27.160.0/19 4637 3491 3561 7018 21508 21508 21508 21508 76.96.132.0/23 4637 3491 3561 7018 21508 21508 21508 21508 76.96.156.0/24 4637 3491 3561 7018 21508 21508 21508 21508 76.104.0.0/17 4637 3491 3549 7922 21508 76.138.192.0/18 4637 3491 3561 7018 21508 76.141.192.0/18 4637 3491 3561 7018 21508 21508 21508 21508
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS21508 79 More Specifics 83 Total Advertisements CCCH-AS5 - Comcast Cable Communications Holdings, Inc
24.125.0.0/18 24.125.0.0/16
24.125.64.0/20 24.125.0.0/16
24.125.80.0/20 24.125.0.0/16
24.125.96.0/19 24.125.0.0/16
24.125.128.0/20 24.125.0.0/16
24.125.144.0/20 24.125.0.0/16
24.125.160.0/20 24.125.0.0/16
24.125.176.0/20 24.125.0.0/16
24.125.192.0/19 24.125.0.0/16
24.125.224.0/19 24.125.0.0/16
24.127.0.0/17 24.126.0.0/15
24.131.0.0/20 24.131.0.0/17
66.208.226.0/24 66.208.192.0/18
67.163.96.0/19 67.160.0.0/11
67.166.160.0/19 67.160.0.0/11
67.172.192.0/19 67.160.0.0/11
67.178.38.0/23 67.160.0.0/11
67.187.0.0/19 67.160.0.0/11
68.57.32.0/19 68.32.0.0/11
68.57.64.0/18 68.32.0.0/11
68.57.128.0/18 68.32.0.0/11
68.85.226.0/24 68.80.0.0/13
68.86.14.0/24 68.80.0.0/13
68.86.24.0/24 68.80.0.0/13
68.86.124.0/22 68.80.0.0/13
68.86.172.0/22 68.80.0.0/13
69.240.240.0/23 69.240.0.0/12
69.241.85.0/24 69.240.0.0/12
69.243.208.0/20 69.240.0.0/12
69.244.224.0/20 69.240.0.0/12
69.252.18.0/23 69.240.0.0/12
70.88.24.0/23 70.88.0.0/14
70.88.168.0/23 70.88.0.0/14
70.88.184.0/21 70.88.0.0/14
70.88.188.0/22 70.88.0.0/14
70.89.232.0/21 70.88.0.0/14
70.91.162.0/24 70.88.0.0/14
71.56.160.0/19 71.56.0.0/13
71.57.208.0/20 71.56.0.0/13
71.62.0.0/16 71.56.0.0/13
71.63.0.0/17 71.56.0.0/13
71.63.0.0/19 71.56.0.0/13
71.63.32.0/19 71.56.0.0/13
71.63.64.0/18 71.56.0.0/13
71.197.0.0/20 71.192.0.0/12
71.206.128.0/18 71.192.0.0/12
71.207.128.0/19 71.192.0.0/12
73.8.32.0/19 73.0.0.0/8
73.126.64.0/18 73.0.0.0/8
73.140.0.0/16 73.0.0.0/8
73.141.0.0/16 73.0.0.0/8
73.142.0.0/17 73.0.0.0/8
73.198.176.0/20 73.0.0.0/8
73.202.128.0/17 73.0.0.0/8
73.207.0.0/16 73.0.0.0/8
73.232.0.0/15 73.0.0.0/8
74.18.128.0/19 74.16.0.0/12
74.22.32.0/20 74.16.0.0/12
74.30.208.0/20 74.16.0.0/12
74.30.240.0/20 74.16.0.0/12
74.92.186.0/23 74.92.0.0/14
74.92.255.0/24 74.92.0.0/14
74.93.116.0/22 74.92.0.0/14
74.94.208.0/21 74.92.0.0/14
74.95.96.0/22 74.92.0.0/14
74.144.32.0/20 74.144.0.0/12
74.146.176.0/20 74.144.0.0/12
74.154.160.0/20 74.144.0.0/12
74.154.240.0/20 74.144.0.0/12
74.158.80.0/20 74.144.0.0/12
75.144.34.0/23 75.144.0.0/14
75.146.16.0/20 75.144.0.0/14
76.27.160.0/19 76.16.0.0/12
76.96.132.0/23 76.96.0.0/11
76.96.156.0/24 76.96.0.0/11
76.104.0.0/17 76.96.0.0/11
76.138.192.0/18 76.128.0.0/11
76.141.192.0/18 76.128.0.0/11
98.37.0.0/19 98.32.0.0/12
| Bogus AS | Announcing-AS | ||
|---|---|---|---|
| AS395527 | Announced by | AS21508 | COMCAST-21508 - Comcast Cable Communications, LLC, US |
whois: 402603
IANA has recorded AS21508 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS21508\n
#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
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# If you see inaccuracies in the results, please report at
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# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
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ASNumber: 21508
ASName: COMCAST-21508
ASHandle: AS21508
RegDate: 2001-05-16
Updated: 2021-01-25
Ref: https://rdap.arin.net/registry/autnum/21508
OrgName: Comcast Cable Communications, LLC
OrgId: CCCS
Address: 1800 Bishops Gate Blvd
City: Mt Laurel
StateProv: NJ
PostalCode: 08054
Country: US
RegDate: 2001-09-18
Updated: 2020-11-18
Ref: https://rdap.arin.net/registry/entity/CCCS
OrgTechHandle: IC161-ARIN
OrgTechName: Comcast Cable Communications Inc
OrgTechPhone: +1-856-792-2300
OrgTechEmail: CNIPEO-Ip-registration@cable.comcast.com
OrgTechRef: https://rdap.arin.net/registry/entity/IC161-ARIN
OrgRoutingHandle: ROUTI25-ARIN
OrgRoutingName: Routing
OrgRoutingPhone: +1-856-792-2300
OrgRoutingEmail: routing@comcast.com
OrgRoutingRef: https://rdap.arin.net/registry/entity/ROUTI25-ARIN
OrgAbuseHandle: NAPO-ARIN
OrgAbuseName: Network Abuse and Policy Observance
OrgAbusePhone: +1-888-565-4329
OrgAbuseEmail: abuse@comcast.net
OrgAbuseRef: https://rdap.arin.net/registry/entity/NAPO-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.
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