ASN Lookup Tool

Comcast Cable Communications, LLC comcast.com US US 103 Routes

AS Data

AS21508

AS21508 – Comcast Cable Communications, LLC

AS Number 21508
AS Name COMCAST-21508
Organization Comcast Cable Communications, LLC (cccs)
Country US
Website comcast.com
Number of IPv4 Routes 17
Number of IPv6 Routes 61
ASN type ISP
Registry ARIN
Date Allocated 2001-05-16

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Use ASN data for AS21508 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route # IPs
2001:559:c10a::/48 ~1×10²⁴
2001:559:c4db::/48 ~1×10²⁴
71.206.128.0/18 16384
2001:559:7db::/48 ~1×10²⁴
2001:559:7a7::/48 ~1×10²⁴
2001:559:804c::/48 ~1×10²⁴
2001:559:5c9::/48 ~1×10²⁴
157.240.147.0/24 256
2001:559:f7::/48 ~1×10²⁴
2001:559:85ff::/48 ~1×10²⁴
2001:559:c344::/48 ~1×10²⁴
50.216.229.0/24 256
2001:559:72b::/48 ~1×10²⁴
71.62.0.0/16 65536
2001:559:8535::/48 ~1×10²⁴
173.242.174.0/24 256
68.85.226.0/24 256
157.240.148.0/24 256
67.187.0.0/19 8192
67.172.192.0/19 8192
2001:559:c0f6::/48 ~1×10²⁴
2001:559:40a::/48 ~1×10²⁴
50.218.47.0/24 256
68.86.124.0/22 1024
2001:559:5db::/48 ~1×10²⁴
2001:559:81bf::/48 ~1×10²⁴
2603:308a::/32 ~79×10²⁷
2001:559:81d7::/48 ~1×10²⁴
2001:559:79e::/48 ~1×10²⁴
75.144.34.0/23 512
184.115.0.0/18 16384
2001:559:788::/48 ~1×10²⁴
2001:559:c460::/48 ~1×10²⁴
2001:559:220::/48 ~1×10²⁴
2001:559:c3e9::/48 ~1×10²⁴
50.204.101.0/24 256
2001:559:871a::/48 ~1×10²⁴
2001:559:c28f::/48 ~1×10²⁴
2001:559:8604::/48 ~1×10²⁴
2001:559:49a::/48 ~1×10²⁴
2001:558:a006::/48 ~1×10²⁴
75.146.16.0/20 4096
74.93.116.0/22 1024
68.86.172.0/22 1024
24.131.0.0/20 4096
2001:559:79d::/48 ~1×10²⁴
2001:559:c071::/48 ~1×10²⁴
71.197.0.0/20 4096
2001:559:37d::/48 ~1×10²⁴
2001:559:87b2::/48 ~1×10²⁴
50.217.1.0/24 256
2001:559:c0::/48 ~1×10²⁴
2001:559:81d8::/48 ~1×10²⁴
2001:559:3b9::/48 ~1×10²⁴
74.92.186.0/23 512
204.194.47.0/24 256
2001:559:c1ca::/48 ~1×10²⁴
2001:559:8445::/48 ~1×10²⁴
68.86.14.0/24 256
50.235.34.0/24 256

Raw Whois Response

#
# 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:       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


OrgRoutingHandle: ROUTI25-ARIN
OrgRoutingName:   Routing
OrgRoutingPhone:  +1-856-792-2300 
OrgRoutingEmail:  routing@comcast.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/ROUTI25-ARIN

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

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.
#

Parsed Whois Response

Peers

AS Number Description Country
AS14583 Virginia Information Technologies Agency VITA US
AS394276 TurnAround Factor, Inc. US
AS393591 Gamewood Technology Group, Inc. US
AS395441 EdgeConneX, INC US
AS54751 Virginia Economic Development Partnership US
AS393415 LITTLER MENDELSON, P.C. US
AS397190 WSP US
AS54113 Fastly, Inc. US
AS400114 Apogee Telecom Inc. US
AS23209 Virginia Housing Development Authority US
AS399232 Seton Home Study School US
AS36364 Mary Washington Hospital, Inc. US
AS10794 Bank of America, National Association US
AS30299 THE MARTIN AGENCY US
AS54883 City of Richmond, Virginia US
AS15173 Newmarket Corporation US
AS27341 Gannet Fleming, Inc. US
AS399938 Berkshire Hathaway Energy Company US
AS15297 EPLUS, Inc. US
AS396083 Framatome Inc. US
AS396452 Loudoun Water US
AS36244 Shenandoah Valley Electric Cooperative US
AS18773 County of Henrico US
AS2134 GS Virtual Network Produban ES
AS40641 MGW Telephone Company, Inc. US
AS19923 Shenandoah University US
AS395772 Augusta Health Care, Inc US
AS395527 NULL ORG
AS22274 Standard Motor Products, Inc US
AS11739 Digital Fortress, Inc. US
AS46643 Virginia College Savings Plan US
AS36040 Google LLC US
AS398475 Drilling Info Inc. US
AS402549 Terraservers Services, LLC US
AS17381 Williams Sonoma US
AS54219 Matthews International Corporation US
AS7922 Comcast Cable Communications, LLC US
AS19404 Quest US
AS394058 Telos Corporation US
AS397483 UNIVERSAL HEALTH SERVICES US
AS393613 Virginia Credit Union, Inc. US
AS63468 Infinitt North America, Inc. US
AS399099 petersburg city public schools US
AS13335 Cloudflare, Inc. US
AS399607 Louisa County Public Schools US
AS27326 VCU HEALTH SYSTEM AUTHORITY US
AS11679 Stihl Inc. US
AS62971 County of Chesterfield US
AS397039 WorldStrides US
AS54391 Crutchfield New Media LLC US
AS32540 HP Hood US

Upstreams

AS Number Description Country
AS7922 Comcast Cable Communications, LLC US

Downstreams

AS Number Description Country
AS14583 Virginia Information Technologies Agency VITA US
AS394276 TurnAround Factor, Inc. US
AS393591 Gamewood Technology Group, Inc. US
AS395441 EdgeConneX, INC US
AS54751 Virginia Economic Development Partnership US
AS393415 LITTLER MENDELSON, P.C. US
AS397190 WSP US
AS54113 Fastly, Inc. US
AS400114 Apogee Telecom Inc. US
AS23209 Virginia Housing Development Authority US

Contacts

Email Contacts

routing@comcast.com CNIPEO-Ip-registration@cable.comcast.com

Abuse Contacts

abuse@comcast.net

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Frequently Asked Questions

ASN AS21508 is an Autonomous System Number used to identify a network for BGP internet routing.
AS21508 is listed under Comcast Cable Communications, LLC.
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.