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AS33666 Comcast Cable Communications, LLC

CMCS - Comcast Cable Communications, LLC · registered in the United States

IPv4 addresses247,29689 prefixes · 0.008% of announced IPv4
Rank in United States#276largest network in US by IPv4 space, of 18,338 · 0.02% of US
Rank worldwide#940of 79,396 networks with IPv4
IPv6130 x /32 (8,519,703 x /48)12 prefixes
CountryUnited States18,679 ASNs registered there
Open AS33666 in ASN lookup Look up an IP in this network (23.25.176.1) All networks in United States

IPv4 prefixes

All 89 prefixes, in address order.

  • 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
  • 69.246.128.0/19
  • 69.246.160.0/20
  • 69.246.176.0/20
  • 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

IPv6 prefixes

All 12 prefixes.

  • 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

Other ASNs named Comcast Cable Communications, LLC

37 other networks use the same organisation name; together with AS33666 they announce 68,427,008 IPv4 addresses. Largest 30 shown.

ASNNameIPv4 addresses
AS7922COMCAST-7922 - Comcast Cable Communications, LLC US42,195,200
AS33491COMCAST-33491 - Comcast Cable Communications, LLC US3,142,144
AS33651CMCS - Comcast Cable Communications, LLC US2,267,136
AS33668CMCS - Comcast Cable Communications, LLC US1,857,536
AS33652CMCS - Comcast Cable Communications, LLC US1,759,744
AS20214COMCAST-20214 - Comcast Cable Communications, LLC US1,720,832
AS7016CCCH-3 - Comcast Cable Communications, LLC US1,577,984
AS33657CMCS - Comcast Cable Communications, LLC US1,553,408
AS7725COMCAST-7725 - Comcast Cable Communications, LLC US1,466,624
AS33287COMCAST-33287 - Comcast Cable Communications, LLC US1,312,512
AS33659CMCS - Comcast Cable Communications, LLC US1,147,136
AS22909COMCAST-22909 - Comcast Cable Communications, LLC US1,075,968
AS13367COMCAST-13367 - Comcast Cable Communications, LLC US1,005,056
AS33667CMCS - Comcast Cable Communications, LLC US999,936
AS33490COMCAST-33490 - Comcast Cable Communications, LLC US852,480
AS21508COMCAST-21508 - Comcast Cable Communications, LLC US689,408
AS22258COMCAST-22258 - Comcast Cable Communications, LLC US664,064
AS33489COMCAST-33489 - Comcast Cable Communications, LLC US647,936
AS33661CMCS - Comcast Cable Communications, LLC US630,528
AS33660CMCS - Comcast Cable Communications, LLC US621,824
AS33654CMCS - Comcast Cable Communications, LLC US337,920
AS33656CMCS - Comcast Cable Communications, LLC US165,632
AS33653CMCS - Comcast Cable Communications, LLC US146,944
AS33665CMCS - Comcast Cable Communications, LLC US112,128
AS33655CMCS - Comcast Cable Communications, LLC US89,600
AS36733DNEO-OSP7 - Comcast Cable Communications, LLC US58,880
AS7015COMCAST-7015 - Comcast Cable Communications, LLC US46,080
AS36732COMCAST-36732 - Comcast Cable Communications, LLC US24,064
AS33662CMCS - Comcast Cable Communications, LLC US3,840
AS33650COMCAST-33650 - Comcast Cable Communications, LLC US3,584

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ASNNameIPv4 addresses
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AS6360#274 UNIVHAWAII - University of Hawaii255,234
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AS20021#277 LNH-INC - Ntirety, Inc.241,152
AS10455#278 LUCENT-CIO - Nokia of America Corporation241,152
AS35847#279 AS-EFTL - Ezee Fiber240,384

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources