AS33667 — CMCS

AS33667 announces 178 IPv4 prefixes covering 995,328 addresses and 67 IPv6 prefixes.

About this network

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

What it's used for

• The address space carries residential cable internet services, evidenced by reverse DNS entries like c-67-181-127-255.hsd1.ca.comcast.net and netnames such as CENTRALCALI-CPE-17 and SACRAMENTO-9.
• With 996,352 IPv4 addresses announced across 181 prefixes and 137 observed neighbours, the high address-to-neighbour ratio indicates a large-scale access network rather than a transit provider.

Notable

• All sampled registrants align with the announcer, consistently listing Comcast Cable Communications, LLC or Comcast Cable Communications.
• The inventory is finely subdivided into regional blocks, including specific Central California and Sacramento designations, reflecting site-by-site segmentation of the corporate estate.

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

Announced prefixes

• 5.182.186.0/24
• 5.182.193.0/24
• 5.182.194.0/23
• 9.142.48.0/20
• 9.142.96.0/19
• 16.5.8.0/23
• 23.30.32.0/20
• 24.2.32.0/19
• 24.7.128.0/18
• 24.10.0.0/17
• 36.255.215.0/24
• 40.27.174.0/23
• 45.67.141.0/24
• 50.73.48.0/20
• 50.79.152.0/21
• 50.189.0.0/19
• 50.191.32.0/19
• 50.192.216.0/21
• 50.194.16.0/20
• 50.203.5.0/24
• 50.203.201.0/24
• 50.207.246.0/24
• 50.209.64.0/19
• 50.211.96.0/19
• 50.213.96.0/19
• 50.222.62.0/24
• 50.236.209.0/24
• 50.239.185.0/24
• 50.245.160.0/19
• 50.250.160.0/19
• 50.255.224.0/19
• 63.246.148.0/24
• 63.246.152.0/24
• 63.246.159.0/24
• 66.208.208.0/22
• 66.208.212.0/23
• 66.208.227.0/24
• 66.208.235.0/24
• 66.208.248.0/23
• 67.161.160.0/19
• 67.164.208.0/20
• 67.164.228.0/22
• 67.166.128.0/19
• 67.169.224.0/20
• 67.172.112.0/20
• 67.172.160.0/19
• 67.174.32.0/19
• 67.174.144.0/20
• 67.181.0.0/16
• 67.182.0.0/17
• 67.182.160.0/19
• 67.187.128.0/17
• 68.85.27.0/24
• 68.85.104.0/23
• 68.85.120.0/24
• 68.85.196.0/24
• 68.87.200.0/22
• 68.87.212.0/23
• 68.87.221.0/24
• 69.139.197.0/24
• 69.241.21.0/24
• 69.252.74.0/23
• 69.252.224.0/23
• 70.88.54.0/23
• 70.89.8.0/22
• 70.89.144.0/22
• 70.90.52.0/23
• 70.90.214.0/23
• 70.91.118.0/24
• 70.91.190.0/23
• 71.19.136.0/22
• 71.27.96.0/19
• 71.193.0.0/18
• 71.195.96.0/19
• 71.195.160.0/19
• 71.197.64.0/18
• 74.1.24.0/23
• 74.92.246.0/24
• 74.92.248.0/24
• 74.93.20.0/22
• 74.93.162.0/23
• 74.93.176.0/21
• 74.95.106.0/24
• 74.95.108.0/23
• 75.144.96.0/22
• 75.144.228.0/22
• 75.146.84.0/23
• 75.146.138.0/23
• 75.147.230.0/23
• 75.147.232.0/21
• 75.150.2.0/23
• 75.151.70.0/23
• 76.20.0.0/17
• 76.29.160.0/20
• 76.105.0.0/18
• 76.114.0.0/18
• 76.125.32.0/19
• 76.127.64.0/18
• 76.137.128.0/17
• 76.149.0.0/17

and 145 more.

Upstream networks

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

Downstream networks

• AS23338 ASN-DCS-01
• AS2894 California Department of Water Resources
• AS11620 Succeed.Net
• AS32688 THE GOLDEN 1 CREDIT UNION
• AS25753 California Public Employees' Retirement System
• AS396513 County of Fresno
• AS46341 California Public Utilities Commission
• AS11829 Cadence Design Systems, Inc.
• AS20940 Akamai International B.V.
• AS46867 Sebastian
• AS53782 Pacific Coast Producers
• AS397062 Sun-Maid Growers of California
• AS17381 Williams-Sonoma
• AS14443 Broadridge Financial Solutions, Inc.
• AS13395 SMART CITY NETWORKS, LIMITED PARTNERSHIP
• AS36040 Google LLC
• AS22768 SYNERGY BROADBAND
• AS397909 Elk Grove Unified School District
• AS11681 Integrity Networks
• AS54113 Fastly, Inc.
• AS18841 Trimble, Inc.
• AS10309 County of Marin
• AS13335 Cloudflare, Inc.
• AS27580 CONVERGEONE HOLDINGS, INC.
• AS394377 County of Tulare

Adjacent networks

• AS7922 Comcast Cable Communications, LLC
• AS3356 Level 3 Parent, LLC
• AS23338 ASN-DCS-01
• AS2894 California Department of Water Resources
• AS11620 Succeed.Net
• AS32688 THE GOLDEN 1 CREDIT UNION
• AS25753 California Public Employees' Retirement System
• AS396513 County of Fresno
• AS46341 California Public Utilities Commission
• AS11829 Cadence Design Systems, Inc.
• AS20940 Akamai International B.V.
• AS46867 Sebastian
• AS53782 Pacific Coast Producers
• AS397062 Sun-Maid Growers of California
• AS17381 Williams-Sonoma
• AS14443 Broadridge Financial Solutions, Inc.
• AS13395 SMART CITY NETWORKS, LIMITED PARTNERSHIP
• AS36040 Google LLC
• AS22768 SYNERGY BROADBAND
• AS397909 Elk Grove Unified School District
• AS11681 Integrity Networks
• AS54113 Fastly, Inc.
• AS18841 Trimble, Inc.
• AS10309 County of Marin
• AS13335 Cloudflare, Inc.