AS33659 — CMCS - Comcast Cable Communications, LLC

AS33659 announces 131 IPv4 prefixes covering 1,147,136 addresses and 126 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 traffic, evidenced by reverse DNS entries such as c-76-116-255-255.hsd1.nj.comcast.net and netnames like PA-36 and NJ-31.
• With 1,147,136 IPv4 addresses announced across 131 prefixes and 88 observed neighbours, the high address-to-neighbour ratio indicates a large-scale access network rather than a transit provider.

Notable

• Registrants are consistent with the announcer, appearing as Comcast Cable Communications, Inc. or Comcast Cable Communications, LLC across the sampled prefixes.
• The inventory is finely subdivided into regional blocks, with netnames referencing specific states and cities such as PHILADELPHIA-CBC-25, NEWJERSEY-CBC-35, and NJ-SMB-1.

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

Announced prefixes

• 9.142.0.0/19
• 23.24.64.0/19
• 23.30.96.0/19
• 23.31.224.0/20
• 24.0.0.0/16
• 24.124.224.0/21
• 45.58.208.0/24
• 45.248.54.0/24
• 50.77.8.0/21
• 50.77.64.0/21
• 50.78.48.0/20
• 50.78.144.0/20
• 50.79.96.0/21
• 50.184.64.0/18
• 50.188.192.0/18
• 50.192.224.0/19
• 50.195.96.0/19
• 50.198.224.0/20
• 50.199.144.0/20
• 50.207.78.0/24
• 50.208.96.0/19
• 50.210.224.0/19
• 50.213.64.0/19
• 50.215.128.0/19
• 50.223.132.0/24
• 50.228.255.0/24
• 50.229.146.0/24
• 50.231.89.0/24
• 50.231.144.0/24
• 50.231.154.0/24
• 50.231.216.0/24
• 50.235.249.0/24
• 50.238.108.0/23
• 50.242.0.0/19
• 50.243.64.0/19
• 50.245.192.0/19
• 50.248.128.0/18
• 50.254.64.0/19
• 63.246.150.0/24
• 64.253.90.0/24
• 66.208.236.0/23
• 68.83.0.0/17
• 68.84.224.0/20
• 68.85.3.0/24
• 68.85.7.0/24
• 68.85.35.0/24
• 68.85.62.0/23
• 68.85.76.0/23
• 68.85.116.0/22
• 68.85.128.0/23
• 68.86.6.0/23
• 68.86.50.0/24
• 68.86.152.0/24
• 68.86.154.0/23
• 68.86.157.0/24
• 68.86.158.0/24
• 68.86.192.0/24
• 68.86.209.0/24
• 68.86.210.0/24
• 68.86.212.0/24
• 68.86.215.0/24
• 68.86.220.0/22
• 68.87.214.0/24
• 68.234.42.0/24
• 69.30.72.0/22
• 69.30.76.0/23
• 69.91.139.0/24
• 69.136.96.0/20
• 69.136.240.0/20
• 69.141.0.0/16
• 69.142.0.0/16
• 69.241.68.0/22
• 69.244.96.0/19
• 69.248.0.0/16
• 69.252.86.0/23
• 70.89.32.0/20
• 70.89.92.0/22
• 70.90.0.0/19
• 71.24.64.0/18
• 71.58.32.0/19
• 71.59.64.0/18
• 71.226.192.0/18
• 74.92.64.0/18
• 74.92.232.0/21
• 74.93.120.0/24
• 75.150.128.0/18
• 76.116.0.0/15
• 78.31.205.0/24
• 96.65.0.0/19
• 96.67.128.0/19
• 96.72.192.0/19
• 96.75.160.0/19
• 96.80.128.0/19
• 96.82.128.0/18
• 96.88.160.0/19
• 96.90.128.0/19
• 96.93.128.0/19
• 96.96.16.0/23
• 96.96.88.0/22
• 96.96.152.0/21

and 157 more.

Upstream networks

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

Downstream networks

• AS21669 New Jersey State Library
• AS13913 Affiliated Monitoring, Inc.
• AS15185 The Hibbert Group
• AS19677 NJTRANSIT
• AS30302 ASPEN DENTAL MANAGEMENT, INC.
• AS11205 City of Philadelphia
• AS397380 Temple University Health System, Inc.
• AS397589 AMEREAM NJP, LLC
• AS16958 Bucks County Intermediate Unit #22
• AS36040 Google LLC
• AS54986 1-800-Flowers.com, Inc.
• AS18583 Hatteras CPC
• AS22774 -Reserved AS-
• AS394206 Deborah Heart and Lung Center
• AS30597 A.M. Best Company
• AS394096 Cape Regional Medical Center, Inc.
• AS402703 Atlantic
• AS54282 Johnson & Johnson
• AS46424 New Jersey Turnpike Authority
• AS397986 Pennsylvania Convention Center Authority
• AS19576 Eastern University
• AS63193 Atlanticare Health System Inc.
• AS26142 MANNINGTON MILLS
• AS54291 Inspira Medical Centers, Inc.
• AS14539 Vantage Labs LLC

Adjacent networks

• AS7922 Comcast Cable Communications, LLC
• AS3356 Level 3 Parent, LLC
• AS21669 New Jersey State Library
• AS13913 Affiliated Monitoring, Inc.
• AS15185 The Hibbert Group
• AS19677 NJTRANSIT
• AS30302 ASPEN DENTAL MANAGEMENT, INC.
• AS11205 City of Philadelphia
• AS397380 Temple University Health System, Inc.
• AS397589 AMEREAM NJP, LLC
• AS16958 Bucks County Intermediate Unit #22
• AS36040 Google LLC
• AS54986 1-800-Flowers.com, Inc.
• AS18583 Hatteras CPC
• AS30597 A.M. Best Company
• AS394206 Deborah Heart and Lung Center
• AS22774 -Reserved AS-
• AS394096 Cape Regional Medical Center, Inc.
• AS54282 Johnson & Johnson
• AS46424 New Jersey Turnpike Authority
• AS402703 Atlantic
• AS397986 Pennsylvania Convention Center Authority
• AS19576 Eastern University
• AS26142 MANNINGTON MILLS
• AS63193 Atlanticare Health System Inc.

Routing security

• RPKI: 162 valid, 9 invalid and 12 not-found announcements; 3,322 ROAs.
• ASPA: none published.
• IRR: 7% of announcements registered; 42 route objects.
• Listed in as-sets: AS-COMCAST-IBONE, AS7922:AS-COMCAST-RANS.