$ query “AS33657” --type=asn → 1 result(s)

AS33657 · CMCS

Comcast Cable Communications LLC

AS33657 is operated by Comcast Cable Communications LLC and serves as a major transit provider, based in the United States since 2005. The system announces a respectable 11 776 IPv4 addresses, and supports IPv6. Most of its address space is geolocated to the United States.

  • 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
April 28, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
30 / 29
IPv6 Prefixes (raw / aggregated)
245 / 226
IPv4 Addresses
11 776
Largest IPv4 Prefix
/20 (4 096 addresses)
Largest IPv6 Prefix
/47
Geolocated Countries
🇺🇸 United States (12 288 IPs)
Prefix Changed
April 21, 2026

Reputation

Reputation
Good — 1 flagged IPs out of 11 776 total (0.01%)

Connectivity Summary

Upstream Providers
3 upstreams providing transit
Downstream Customers
125 downstreams buying transit
Unclassified
15 unclassified BGP neighbors
Degree
143 unique BGP neighbors
Reach
149 networks in customer cone

Upstream Providers (3)

Prefix Lists

IPv4 Prefixes (30 total)

  • 69.67.80.0/20 (4 096 addresses (/20 prefix))
  • 50.223.158.0/23 (512 addresses (/23 prefix))
  • 192.110.220.0/23 (512 addresses (/23 prefix))
  • 50.232.184.0/24 (256 addresses (/24 prefix))
  • 50.235.236.0/24 (256 addresses (/24 prefix))
  • 50.204.128.0/24 (256 addresses (/24 prefix))
  • 50.205.74.0/24 (256 addresses (/24 prefix))
  • 50.207.162.0/24 (256 addresses (/24 prefix))
  • 50.216.214.0/24 (256 addresses (/24 prefix))
  • 50.219.87.0/24 (256 addresses (/24 prefix))
  • 50.203.251.0/24 (256 addresses (/24 prefix))
  • 50.224.212.0/24 (256 addresses (/24 prefix))
  • 50.232.109.0/24 (256 addresses (/24 prefix))
  • 50.232.173.0/24 (256 addresses (/24 prefix))
  • 50.201.252.0/24 (256 addresses (/24 prefix))
  • 50.235.98.0/24 (256 addresses (/24 prefix))
  • 50.204.116.0/24 (256 addresses (/24 prefix))
  • 50.236.38.0/24 (256 addresses (/24 prefix))
  • 50.236.234.0/24 (256 addresses (/24 prefix))
  • 50.238.112.0/24 (256 addresses (/24 prefix))
  • 50.238.163.0/24 (256 addresses (/24 prefix))
  • 50.239.232.0/24 (256 addresses (/24 prefix))
  • 50.202.155.0/24 (256 addresses (/24 prefix))
  • 76.78.2.0/24 (256 addresses (/24 prefix))
  • 107.1.101.0/24 (256 addresses (/24 prefix))
  • 50.202.117.0/24 (256 addresses (/24 prefix))
  • 192.189.235.0/24 (256 addresses (/24 prefix))
  • 199.249.199.0/24 (256 addresses (/24 prefix))
  • 208.87.105.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (245 total)

  • 2001:559:488::/47
  • 2001:559:c42a::/47
  • 2001:559:c3f2::/47
  • 2001:559:c2b0::/47
  • 2001:559:c140::/47
  • 2001:559:c0c2::/47
  • 2001:559:8666::/47
  • 2001:559:865a::/47
  • 2001:559:8582::/47
  • 2001:559:857e::/47
  • 2001:559:8262::/47
  • 2001:559:8212::/47
  • 2001:559:816a::/47
  • 2001:559:25a::/47
  • 2001:559:8140::/47
  • 2001:559:80fc::/47
  • 2001:559:80b0::/47
  • 2001:559:8040::/47
  • 2001:559:2ca::/47
  • 2001:559:840d::/48
  • 2001:559:84cc::/48
  • 2001:559:30d::/48
  • 2001:559:319::/48
  • 2001:559:377::/48
  • 2001:559:3ba::/48
  • 2001:559:3ca::/48
  • 2001:559:3d2::/48
  • 2001:559:3dc::/48
  • 2001:559:3eb::/48
  • 2001:559:3f1::/48
  • 2001:559:42c::/48
  • 2001:559:43a::/48
  • 2001:559:45a::/48
  • 2001:559:46c::/48
  • 2001:559:2f3::/48
  • 2001:559:491::/48
  • 2001:559:4a0::/48
  • 2001:559:4a5::/48
  • 2001:559:4a8::/48
  • 2001:559:548::/48
  • 2001:559:574::/48
  • 2001:559:588::/48
  • 2001:559:5b7::/48
  • 2001:559:5cb::/48
  • 2001:559:5cd::/48
  • 2001:559:5d3::/48
  • 2001:559:5ef::/48
  • 2001:559:70d::/48
  • 2001:559:714::/48
  • 2001:559:718::/48
  • and 176 more