AS33666 — CMCS

AS33666 announces 87 IPv4 prefixes covering 247,296 addresses and 12 IPv6 prefixes.

About this network

The AS handle CMCS is held by Comcast Cable Communications, LLC.

What it's used for

• The address space carries residential cable internet access, evidenced by reverse DNS entries such as c-67-177-80-0.hsd1.fl.comcast.net and c-68-35-208-0.hsd1.al.comcast.net.
• With 247,296 IPv4 addresses announced across 89 prefixes and only 6 observed neighbours, the high address-to-neighbour ratio indicates this is an access network serving end-users rather than a transit provider.

Notable

• Registrants are consistent with the announcer, appearing as both Comcast Cable Communications, LLC and Comcast Cable Communications, Inc. across the largest prefixes.
• The inventory is finely subdivided into regional blocks, with netnames like TALLAHASSEE-1, JUMPSTART-1, and NORTH-GULF-21 reflecting site-by-site segmentation of the corporate estate.
• The AS was first seen in RIS in 2007, indicating it has been active for nearly two decades.

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

Announced prefixes

• 23.25.176.0/21
• 23.30.192.0/21
• 24.153.90.0/23
• 50.77.32.0/21
• 50.185.32.0/20
• 50.215.208.0/21
• 50.240.0.0/21
• 50.242.152.0/21
• 50.248.120.0/21
• 50.252.152.0/21
• 64.139.92.0/24
• 66.170.177.0/24
• 66.170.179.0/24
• 66.208.193.0/24
• 67.177.64.0/18
• 68.35.192.0/18
• 68.42.48.0/20
• 68.46.224.0/20
• 68.47.128.0/19
• 68.57.128.0/18
• 68.59.48.0/20
• 68.59.64.0/18
• 68.62.192.0/20
• 68.63.0.0/18
• 68.63.64.0/20
• 68.84.16.0/20
• 68.85.202.0/24
• 68.85.236.0/23
• 68.86.30.0/24
• 68.86.52.0/24
• 68.86.181.0/24
• 68.87.161.0/24
• 68.87.248.0/24
• 69.139.196.0/24
• 69.241.1.0/24
• 69.241.83.0/24
• 69.243.224.0/20
• 69.244.208.0/20
• 69.246.128.0/18
• 69.252.47.0/24
• 69.252.49.0/24
• 69.254.160.0/19
• 69.254.208.0/20
• 70.88.10.0/23
• 70.88.48.0/23
• 70.88.50.0/24
• 70.89.68.0/23
• 70.91.116.0/23
• 70.91.161.0/24
• 70.91.223.0/24
• 71.25.200.0/21
• 71.203.96.0/20
• 71.229.0.0/19
• 74.92.250.0/23
• 74.93.166.0/24
• 74.94.223.0/24
• 74.94.244.0/22
• 74.95.135.0/24
• 74.95.146.0/24
• 75.144.32.0/23
• 75.144.224.0/22
• 75.149.232.0/21
• 75.150.24.0/22
• 76.140.128.0/18
• 96.65.144.0/20
• 96.72.24.0/21
• 96.76.0.0/21
• 96.79.216.0/23
• 96.81.8.0/21
• 96.84.148.0/22
• 96.87.0.0/21
• 96.90.16.0/21
• 96.94.24.0/21
• 96.97.79.0/24
• 96.108.32.0/23
• 96.110.145.0/24
• 96.110.211.0/24
• 96.113.188.0/24
• 96.208.50.0/24
• 162.151.81.0/24
• 162.151.221.0/24
• 173.10.200.0/21
• 173.12.152.0/21
• 173.163.232.0/21
• 184.116.240.0/21
• 184.116.248.0/22
• 199.120.255.0/24
• 2001:558:240::/44
• 2001:558:5012::/48
• 2001:558:6024::/48
• 2001:558:a01e::/48
• 2001:558:fe28::/48
• 2001:559:195::/48
• 2001:559:233::/48
• 2001:559:c507::/48
• 2601:4c0::/26
• 2603:24c0::/26
• 2603:301c::/32
• 2603:30a0::/32

Upstream networks

• AS7922 Comcast Cable Communications, LLC

Downstream networks

• AS7970 Leon County School District
• AS13335 Cloudflare, Inc.
• AS1830 Gulf Coast State College
• AS54248 School Board of Gadsden County
• AS53931 Talquin Electric Coop, Inc

Adjacent networks

• AS7922 Comcast Cable Communications, LLC
• AS7970 Leon County School District
• AS13335 Cloudflare, Inc.
• AS1830 Gulf Coast State College
• AS54248 School Board of Gadsden County
• AS53931 Talquin Electric Coop, Inc