AS33656 — CMCS

AS33656 announces 48 IPv4 prefixes covering 165,632 addresses and 13 IPv6 prefixes.

About this network

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

What it's used for

• The address space carries residential broadband access, evidenced by reverse DNS entries such as c-71-238-223-254.hsd1.ar.comcast.net and c-67-162-200-0.hsd1.ar.comcast.net.
• With 165,632 IPv4 addresses announced across 48 prefixes and only 2 observed neighbours, the high address-to-neighbour ratio indicates a large-scale access network rather than a transit provider.

Notable

• Registrants for the largest prefixes include both "Comcast Cable Communications, Inc." and "Comcast Cable Communications, LLC", reflecting the corporate entity name change over time.
• Netnames such as LITTLE-ROCK-10 and LITTLEROCK-CBC-28 identify this specific AS as serving the Little Rock, Arkansas region within Comcast's broader infrastructure.
• The inventory includes 13 IPv6 prefixes, including a /26 block, supporting dual-stack residential connectivity.

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

Announced prefixes

• 23.30.204.0/23
• 23.31.124.0/22
• 50.77.6.0/23
• 50.193.228.0/22
• 50.214.80.0/21
• 50.242.144.0/22
• 50.245.84.0/22
• 50.251.16.0/22
• 50.254.220.0/22
• 67.162.192.0/19
• 67.172.0.0/20
• 68.85.132.0/24
• 68.86.178.0/24
• 68.87.223.0/24
• 68.87.225.0/24
• 69.241.120.0/24
• 69.252.46.0/24
• 70.88.14.0/23
• 70.89.64.0/23
• 70.90.226.0/23
• 70.91.163.0/24
• 71.25.248.0/21
• 71.238.128.0/17
• 74.92.183.0/24
• 74.93.50.0/23
• 74.94.216.0/22
• 75.145.192.0/23
• 75.151.68.0/23
• 76.125.64.0/18
• 76.134.0.0/17
• 96.67.72.0/22
• 96.70.16.0/21
• 96.76.8.0/21
• 96.81.0.0/22
• 96.84.144.0/22
• 96.85.248.0/21
• 96.91.64.0/22
• 96.91.76.0/22
• 96.96.95.0/24
• 96.97.128.0/20
• 96.108.37.0/24
• 96.109.102.0/24
• 98.50.192.0/18
• 173.10.192.0/22
• 173.160.8.0/21
• 174.53.0.0/18
• 184.115.204.0/22
• 184.117.180.0/22
• 2001:558:60::/44
• 2001:558:fe22::/48
• 2001:559:1e2::/48
• 2001:559:3ea::/48
• 2001:559:7ad::/48
• 2001:559:8197::/48
• 2001:559:84b6::/48
• 2001:559:c12f::/48
• 2001:559:c156::/48
• 2601:380::/26
• 2603:2380::/26
• 2603:3013::/32
• 2603:309a::/32

Upstream networks

• AS7922 Comcast Cable Communications, LLC

Downstream networks

• AS398111 Maverick Transportation, LLC

Adjacent networks

• AS7922 Comcast Cable Communications, LLC
• AS398111 Maverick Transportation, LLC

Routing security

• RPKI: 7 valid, 0 invalid and 0 not-found announcements; 71 ROAs.
• ASPA: none published.
• IRR: 0% of announcements registered; 10 route objects.
• Listed in as-sets: AS-COMCAST-IBONE, AS-COMCAST-RANS, AS7922:AS-COMCAST-RANS.