$ query “AS33651” --type=asn → 1 result(s)

AS33651 · CMCS

Comcast Cable Communications LLC

AS33651 is run by Comcast Cable Communications LLC and is a major transit provider, established in the United States in 2005. The system announces a respectable 70 144 IPv4 addresses, and supports IPv6. Its primary geographic footprint is in the United States, with additional presence in Australia and Russia, and smaller footprints in 2 additional countries. Prefix announcements for this AS were recently updated.

  • Top 5% — Top 5% of all autonomous systems by reach and degree

Basic Information

Country
🇺🇸 United States
Category
Internet Service Provider
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
February 16, 2005
Last Changed
March 04, 2026
Last Seen
May 15, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
81 / 77
IPv6 Prefixes (raw / aggregated)
196 / 178
IPv4 Addresses
70 144
Largest IPv4 Prefix
/18 (16 384 addresses)
Largest IPv6 Prefix
/29
Geolocated Countries
🇺🇸 United States (67 840 IPs), 🇦🇺 Australia (2 304 IPs), 🇷🇺 Russia (256 IPs) and 2 more
Prefix Changed
May 14, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
2 upstreams providing transit
Downstream Customers
170 downstreams buying transit
Unclassified
5 unclassified BGP neighbors
Degree
177 unique BGP neighbors
Reach
240 networks in customer cone

Upstream Providers (2)

  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS7922 — COMCAST-7922

Prefix Lists

IPv4 Prefixes (81 total)

  • 140.89.64.0/18 (16 384 addresses (/18 prefix))
  • 135.132.64.0/19 (8 192 addresses (/19 prefix))
  • 9.142.96.0/19 (8 192 addresses (/19 prefix))
  • 138.226.64.0/20 (4 096 addresses (/20 prefix))
  • 9.142.48.0/20 (4 096 addresses (/20 prefix))
  • 138.226.192.0/21 (2 048 addresses (/21 prefix))
  • 138.226.112.0/21 (2 048 addresses (/21 prefix))
  • 138.226.48.0/21 (2 048 addresses (/21 prefix))
  • 64.84.120.0/21 (2 048 addresses (/21 prefix))
  • 64.84.96.0/21 (2 048 addresses (/21 prefix))
  • 24.104.138.0/23 (512 addresses (/23 prefix))
  • 24.104.72.0/23 (512 addresses (/23 prefix))
  • 50.206.120.0/23 (512 addresses (/23 prefix))
  • 5.182.194.0/23 (512 addresses (/23 prefix))
  • 50.201.8.0/23 (512 addresses (/23 prefix))
  • 169.230.76.0/23 (512 addresses (/23 prefix))
  • 50.235.20.0/23 (512 addresses (/23 prefix))
  • 50.206.219.0/24 (256 addresses (/24 prefix))
  • 63.246.152.0/24 (256 addresses (/24 prefix))
  • 5.182.186.0/24 (256 addresses (/24 prefix))
  • 50.207.182.0/24 (256 addresses (/24 prefix))
  • 50.207.190.0/24 (256 addresses (/24 prefix))
  • 50.207.216.0/24 (256 addresses (/24 prefix))
  • 50.216.23.0/24 (256 addresses (/24 prefix))
  • 50.216.212.0/24 (256 addresses (/24 prefix))
  • 50.218.46.0/24 (256 addresses (/24 prefix))
  • 50.219.139.0/24 (256 addresses (/24 prefix))
  • 50.222.26.0/24 (256 addresses (/24 prefix))
  • 50.222.50.0/24 (256 addresses (/24 prefix))
  • 50.222.102.0/24 (256 addresses (/24 prefix))
  • 50.224.7.0/24 (256 addresses (/24 prefix))
  • 50.227.120.0/24 (256 addresses (/24 prefix))
  • 50.227.186.0/24 (256 addresses (/24 prefix))
  • 50.228.12.0/24 (256 addresses (/24 prefix))
  • 50.228.130.0/24 (256 addresses (/24 prefix))
  • 50.229.212.0/24 (256 addresses (/24 prefix))
  • 50.230.66.0/24 (256 addresses (/24 prefix))
  • 50.231.143.0/24 (256 addresses (/24 prefix))
  • 50.232.196.0/24 (256 addresses (/24 prefix))
  • 50.233.45.0/24 (256 addresses (/24 prefix))
  • 50.234.130.0/24 (256 addresses (/24 prefix))
  • 50.205.226.0/24 (256 addresses (/24 prefix))
  • 50.235.233.0/24 (256 addresses (/24 prefix))
  • 50.236.66.0/24 (256 addresses (/24 prefix))
  • 50.239.184.0/24 (256 addresses (/24 prefix))
  • 63.246.148.0/24 (256 addresses (/24 prefix))
  • 50.206.118.0/24 (256 addresses (/24 prefix))
  • 63.246.159.0/24 (256 addresses (/24 prefix))
  • 50.204.137.0/24 (256 addresses (/24 prefix))
  • 50.204.119.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (196 total)

  • 2a0c:1900::/29
  • 2620:10a:6000::/44
  • 2001:559:86e4::/47
  • 2001:559:86dc::/47
  • 2001:559:8584::/47
  • 2001:559:8342::/47
  • 2001:559:1c0::/47
  • 2001:559:c522::/47
  • 2001:559:c0e4::/47
  • 2001:559:86f4::/47
  • 2001:559:9c::/47
  • 2001:559:8542::/47
  • 2001:559:86a8::/47
  • 2001:559:8660::/47
  • 2001:559:865e::/47
  • 2001:559:8646::/47
  • 2001:559:8632::/47
  • 2001:559:8614::/47
  • 2001:559:85f4::/47
  • 2001:559:85a2::/47
  • 2001:559:84a3::/48
  • 2001:559:8368::/48
  • 2001:559:24f::/48
  • 2001:559:259::/48
  • 2001:559:262::/48
  • 2001:559:295::/48
  • 2001:559:2ac::/48
  • 2001:559:2dd::/48
  • 2001:559:2e6::/48
  • 2001:559:305::/48
  • 2001:559:329::/48
  • 2001:559:340::/48
  • 2001:559:35b::/48
  • 2001:559:376::/48
  • 2001:559:37e::/48
  • 2001:559:394::/48
  • 2001:559:39c::/48
  • 2001:559:3bd::/48
  • 2001:559:3be::/48
  • 2001:559:3c3::/48
  • 2001:559:457::/48
  • 2001:559:499::/48
  • 2001:559:4ac::/48
  • 2001:559:4b2::/48
  • 2001:559:519::/48
  • 2001:559:520::/48
  • 2001:559:53e::/48
  • 2001:559:546::/48
  • 2001:559:549::/48
  • 2001:559:55a::/48