AS33652 — CMCS
AS33652 announces 166 IPv4 prefixes covering 1,759,744 addresses and 151 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 217 more.
Upstream networks
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.
- AS54384 CORE Electric Cooperative
- AS395980 Comcast Cable Communications, LLC
- AS54113 Fastly, Inc.
- AS27580 CONVERGEONE HOLDINGS, INC.
- AS20381 Cable Television Laboratories, Inc.
- AS11200 Regis University
- AS398985 City of Arvada
- AS53983 CorKat Data Solutions, LLC
- AS29711 Centura Health Corporation
- AS395566 Orbital Media Networks, Inc.
- AS11091 -Reserved AS-
- AS11004 City of Golden
- AS23290 El Paso County
- AS10844 Vastnet Corp
- AS31904 Northern Water
- AS22593 Blue Cross and Blue Shield of North Carolina
- AS36585 City of Greeley
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.
- AS54384 CORE Electric Cooperative
- AS395980 Comcast Cable Communications, LLC
- AS27580 CONVERGEONE HOLDINGS, INC.
- AS54113 Fastly, Inc.
- AS20381 Cable Television Laboratories, Inc.
- AS398985 City of Arvada
- AS11200 Regis University
- AS53983 CorKat Data Solutions, LLC
- AS29711 Centura Health Corporation
- AS395566 Orbital Media Networks, Inc.
- AS11004 City of Golden
- AS31904 Northern Water
- AS11091 -Reserved AS-
- AS23290 El Paso County
- AS10844 Vastnet Corp
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IPv4 Prefixes
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