AS33660 — CMCS - Comcast Cable Communications, LLC

AS33660 announces 96 IPv4 prefixes covering 621,824 addresses and 54 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 services, evidenced by reverse DNS entries like c-174-52-64-0.hsd1.ut.comcast.net and netnames such as UTAH-CPE-36.
• With 622,080 IPv4 addresses announced across 97 prefixes and 69 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, with minor variations in legal suffixes (Inc., LLC) across different prefix blocks.
• The inventory is finely subdivided into numerous /17 and /18 blocks, reflecting site-by-site segmentation typical of a major cable operator's internal estate.
• PeeringDB classifies the scope as Regional, specifically for the Utah market, aligning with the hsd1.ut domain in the reverse DNS records.

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

Announced prefixes

• 23.30.48.0/20
• 24.2.64.0/19
• 24.2.96.0/20
• 24.10.128.0/17
• 24.11.0.0/17
• 24.124.175.0/24
• 24.153.94.0/23
• 50.73.32.0/20
• 50.77.44.0/22
• 50.79.64.0/21
• 50.176.96.0/20
• 50.184.168.0/21
• 50.188.136.0/21
• 50.188.144.0/20
• 50.192.192.0/20
• 50.198.176.0/20
• 50.204.89.0/24
• 50.207.68.0/24
• 50.208.240.0/20
• 50.213.136.0/21
• 50.215.216.0/21
• 50.222.146.0/24
• 50.222.157.0/24
• 50.224.25.0/24
• 50.243.0.0/20
• 50.247.48.0/20
• 50.252.128.0/20
• 50.255.192.0/20
• 67.161.208.0/20
• 67.161.240.0/20
• 67.163.64.0/19
• 67.164.192.0/20
• 67.164.248.0/22
• 67.166.64.0/20
• 67.166.96.0/19
• 67.169.240.0/20
• 67.171.112.0/20
• 67.172.224.0/19
• 67.177.0.0/18
• 67.182.192.0/18
• 67.186.192.0/18
• 68.85.39.0/24
• 68.87.78.0/24
• 68.87.170.0/23
• 68.87.220.0/24
• 69.139.230.0/24
• 69.252.69.0/24
• 69.252.200.0/23
• 70.89.244.0/22
• 70.90.212.0/23
• 70.91.210.0/24
• 71.195.192.0/18
• 71.199.0.0/18
• 74.92.244.0/23
• 74.95.52.0/22
• 75.144.8.0/22
• 75.145.56.0/22
• 75.146.88.0/22
• 75.148.96.0/21
• 75.149.224.0/22
• 76.23.0.0/18
• 76.27.0.0/17
• 76.96.18.0/23
• 76.96.43.0/24
• 76.96.98.0/23
• 76.129.64.0/18
• 76.140.0.0/17
• 76.149.128.0/17
• 96.73.0.0/19
• 96.77.176.0/20
• 96.82.240.0/20
• 96.86.192.0/19
• 96.92.80.0/20
• 96.96.72.0/23
• 96.109.185.0/24
• 96.110.232.0/23
• 96.114.140.0/22
• 96.115.152.0/23
• 96.216.76.0/22
• 96.216.180.0/24
• 96.217.48.0/22
• 98.32.64.0/19
• 98.33.128.0/17
• 107.3.64.0/18
• 129.134.166.0/23
• 162.151.39.0/24
• 162.151.43.0/24
• 162.151.49.0/24
• 173.8.88.0/21
• 173.10.16.0/20
• 173.14.224.0/20
• 173.165.128.0/20
• 174.52.0.0/16
• 174.162.128.0/17
• 184.117.144.0/20
• 192.16.177.0/24
• 2001:558:100::/44
• 2001:558:5028::/48
• 2001:558:6008::/48
• 2001:558:a025::/48

and 50 more.

Upstream networks

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

Downstream networks

• AS19477 F J Management Inc.
• AS27178 Practice Management Technologies and Services
• AS54113 Fastly, Inc.
• AS23389 Campbell Scientific, Inc.
• AS11052 Intermountain Health Care, Inc.
• AS33741 Dennis Group
• AS54629 Associated Food Stores, Inc.
• AS400988 Salt Lake County
• AS11396 Williams Information Technology LLC
• AS10786 Chartway Federal Credit Union
• AS40644 Integra Financial Services, LLC
• AS393459 Domo, Inc.
• AS397612 ARCHITECTURAL NEXUS, INC
• AS54308 RETOUCHUP.COM
• AS16785 USANA Inc
• AS393541 EXTRA SPACE STORAGE
• AS399421 EDUCATORS MUTUAL INSURANCE ASSOCIATION
• AS394185 Bank of Utah
• AS54977 Merit Medical Systems, Inc
• AS23154 Sanmina-SCI Corporation
• AS55251 TaxHawk, Inc.
• AS399965 Jazz Basketball Investors LLC
• AS402114 CYPRUS CREDIT UNION INC.
• AS33173 Myriad Genetics Incorporated
• AS29298 SUSE Software Solutions Germany GmbH

Adjacent networks

• AS7922 Comcast Cable Communications, LLC
• AS3356 Level 3 Parent, LLC
• AS19477 F J Management Inc.
• AS27178 Practice Management Technologies and Services
• AS54113 Fastly, Inc.
• AS23389 Campbell Scientific, Inc.
• AS11052 Intermountain Health Care, Inc.
• AS33741 Dennis Group
• AS54629 Associated Food Stores, Inc.
• AS400988 Salt Lake County
• AS40644 Integra Financial Services, LLC
• AS54308 RETOUCHUP.COM
• AS10786 Chartway Federal Credit Union
• AS11396 Williams Information Technology LLC
• AS393459 Domo, Inc.
• AS397612 ARCHITECTURAL NEXUS, INC
• AS399421 EDUCATORS MUTUAL INSURANCE ASSOCIATION
• AS16785 USANA Inc
• AS54977 Merit Medical Systems, Inc
• AS393541 EXTRA SPACE STORAGE
• AS394185 Bank of Utah
• AS23154 Sanmina-SCI Corporation
• AS55251 TaxHawk, Inc.
• AS399965 Jazz Basketball Investors LLC
• AS402114 CYPRUS CREDIT UNION INC.

Routing security

• RPKI: 55 valid, 0 invalid and 3 not-found announcements; 1,377 ROAs.
• ASPA: none published.
• IRR: 81% of announcements registered; 106 route objects.
• Listed in as-sets: AS-COMCAST-IBONE, AS-COMCAST-RANS, AS7922:AS-COMCAST-RANS.