AS33652 — CMCS - Comcast Cable Communications, LLC

AS33652 announces 166 IPv4 prefixes covering 1,759,744 addresses and 148 IPv6 prefixes.

About this network

CMCS is the AS handle for Comcast Cable Communications, LLC.

What it's used for

• The space carries residential cable internet and VoIP services, evidenced by netnames like DENVER-CPE-18, COMCAST-VOIP-4, and reverse DNS entries such as c-75-70-128-0.hsd1.co.comcast.net.
• With 1,759,744 IPv4 addresses announced across 166 prefixes and 78 observed neighbours, the high address-to-neighbour ratio indicates a large-scale access network rather than a transit provider.

Notable

• Registrants consistently identify as Comcast Cable Communications entities, including Comcast Cable Communications, LLC and Comcast Cable Communications Holdings, Inc, aligning with the announcer.
• The address inventory is heavily concentrated in the Denver and Colorado regions, as reflected in netnames like COLORADO-10 and DENVER-5, suggesting this AS covers a specific regional footprint within Comcast's broader national infrastructure.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 23.24.128.0/19
• 23.31.64.0/19
• 24.8.0.0/15
• 24.104.146.0/24
• 24.124.155.0/24
• 24.124.156.0/23
• 24.128.0.0/17
• 50.76.128.0/20
• 50.78.80.0/21
• 50.78.192.0/20
• 50.147.168.0/24
• 50.169.236.0/24
• 50.169.239.0/24
• 50.185.0.0/19
• 50.189.32.0/19
• 50.190.64.0/18
• 50.191.96.0/19
• 50.194.128.0/19
• 50.198.192.0/19
• 50.201.230.0/24
• 50.203.219.0/24
• 50.204.71.0/24
• 50.205.29.0/24
• 50.206.155.0/24
• 50.208.0.0/19
• 50.209.224.0/19
• 50.211.224.0/19
• 50.214.0.0/19
• 50.220.96.0/24
• 50.221.47.0/24
• 50.221.49.0/24
• 50.222.96.0/24
• 50.222.100.0/24
• 50.225.186.0/24
• 50.227.104.0/24
• 50.227.142.0/24
• 50.228.62.0/24
• 50.232.50.0/24
• 50.233.144.0/24
• 50.236.26.0/24
• 50.237.69.0/24
• 50.238.57.0/24
• 50.238.58.0/24
• 50.242.128.0/20
• 50.243.128.0/19
• 50.246.192.0/19
• 50.250.128.0/19
• 50.253.96.0/19
• 64.50.168.0/21
• 64.130.16.0/20
• 67.161.128.0/19
• 67.161.192.0/20
• 67.162.128.0/19
• 67.164.160.0/19
• 67.164.224.0/22
• 67.164.252.0/22
• 67.165.192.0/18
• 67.166.0.0/18
• 67.172.128.0/19
• 67.173.224.0/19
• 67.174.96.0/19
• 67.174.176.0/20
• 67.176.0.0/17
• 67.177.192.0/18
• 67.190.0.0/17
• 67.190.128.0/18
• 68.85.89.0/24
• 68.85.107.0/24
• 68.85.220.0/23
• 68.86.19.0/24
• 68.86.103.0/24
• 68.86.104.0/23
• 68.86.128.0/23
• 68.86.179.0/24
• 68.87.70.0/24
• 68.87.247.0/24
• 69.139.228.0/24
• 69.241.22.0/24
• 69.241.125.0/24
• 70.89.160.0/20
• 70.90.112.0/21
• 70.91.168.0/21
• 71.24.128.0/19
• 71.56.192.0/18
• 71.196.128.0/17
• 71.205.0.0/16
• 71.229.128.0/17
• 71.237.0.0/17
• 74.92.208.0/20
• 74.93.224.0/20
• 74.95.112.0/21
• 75.70.0.0/15
• 75.145.112.0/20
• 75.148.32.0/20
• 75.148.112.0/20
• 75.151.80.0/20
• 76.25.0.0/16
• 76.96.47.0/24
• 76.120.0.0/17
• 76.130.0.0/15

and 214 more.

Upstream networks

• AS7922 Comcast Cable Communications, LLC
• AS3356 Level 3 Parent, LLC

Downstream networks

• AS18676 Avaya LLC
• AS17307 NTT Global Networks Incorporated
• AS15071 BAX GLOBAL
• AS54053 Realogy Group LLC
• AS12156 City of Aurora Colorado
• AS19076 Weld County Government
• AS64246 Cator, Ruma & Associates, Co.
• AS35928 BECKMAN COULTER, INC.
• AS36551 Compassion International, Inc.
• AS395980 Comcast Cable Communications, LLC
• AS10753 Level 3 Parent, LLC
• AS54113 Fastly, Inc.
• AS27580 CONVERGEONE HOLDINGS, INC.
• AS20381 Cable Television Laboratories, Inc.
• AS53983 CorKat Data Solutions, LLC
• AS398985 City of Arvada
• AS29711 Centura Health Corporation
• AS11200 Regis University
• AS46299 City of Littleton
• AS31904 Northern Water
• AS11004 City of Golden
• AS54384 CORE Electric Cooperative
• AS10844 Vastnet Corp
• AS23290 El Paso County
• AS395566 Orbital Media Networks, Inc.

Adjacent networks

• AS7922 Comcast Cable Communications, LLC
• AS18676 Avaya LLC
• AS3356 Level 3 Parent, LLC
• AS17307 NTT Global Networks Incorporated
• AS15071 BAX GLOBAL
• AS54053 Realogy Group LLC
• AS12156 City of Aurora Colorado
• AS19076 Weld County Government
• AS64246 Cator, Ruma & Associates, Co.
• AS35928 BECKMAN COULTER, INC.
• AS36551 Compassion International, Inc.
• AS395980 Comcast Cable Communications, LLC
• AS10753 Level 3 Parent, LLC
• AS54113 Fastly, Inc.
• AS27580 CONVERGEONE HOLDINGS, INC.
• AS20381 Cable Television Laboratories, Inc.
• AS398985 City of Arvada
• AS53983 CorKat Data Solutions, LLC
• AS11200 Regis University
• AS29711 Centura Health Corporation
• AS11004 City of Golden
• AS54384 CORE Electric Cooperative
• AS31904 Northern Water
• AS46299 City of Littleton
• AS11091 -Reserved AS-

Routing security

• RPKI: 175 valid, 0 invalid and 6 not-found announcements; 491 ROAs.
• ASPA: none published.
• IRR: 82% of announcements registered; 278 route objects.
• Listed in as-sets: AS-COMCAST-IBONE, AS-COMCAST-RANS, AS-CTBC-CUSTOMERS109, AS7922:AS-COMCAST-RANS.