$ query “AS33660” --type=asn → 1 result(s)

AS33660 · CMCS

Comcast Cable Communications LLC

AS33660 is run by Comcast Cable Communications LLC and is a mid-size transit provider, based in the United States since 2005. The system announces 2 560 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
Mid-size Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
February 16, 2005
Last Changed
May 01, 2026
Last Seen
May 13, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
10 / 9
IPv6 Prefixes (raw / aggregated)
54 / 50
IPv4 Addresses
2 560
Largest IPv4 Prefix
/23 (512 addresses)
Largest IPv6 Prefix
/47
Geolocated Countries
🇺🇸 United States (2 560 IPs)
Prefix Changed
April 25, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
2 upstreams providing transit
Peers
1 network exchanging traffic without transit
Downstream Customers
63 downstreams buying transit
Degree
66 unique BGP neighbors
Reach
63 networks in customer cone

Upstream Providers (2)

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

Prefix Lists

IPv4 Prefixes (10 total)

  • 129.134.166.0/23 (512 addresses (/23 prefix))
  • 50.204.89.0/24 (256 addresses (/24 prefix))
  • 50.207.68.0/24 (256 addresses (/24 prefix))
  • 50.217.32.0/24 (256 addresses (/24 prefix))
  • 50.222.146.0/24 (256 addresses (/24 prefix))
  • 50.222.157.0/24 (256 addresses (/24 prefix))
  • 50.224.25.0/24 (256 addresses (/24 prefix))
  • 50.237.123.0/24 (256 addresses (/24 prefix))
  • 192.16.177.0/24 (256 addresses (/24 prefix))

IPv6 Prefixes (54 total)

  • 2001:559:fa::/47
  • 2001:559:3b2::/47
  • 2001:559:8484::/47
  • 2a03:2887:ff46::/47
  • 2001:559:29::/48
  • 2001:559:20a::/48
  • 2001:559:26c::/48
  • 2001:559:2de::/48
  • 2001:559:2e4::/48
  • 2001:559:31a::/48
  • 2001:559:37f::/48
  • 2001:559:3c4::/48
  • 2001:559:41a::/48
  • 2001:559:4a7::/48
  • 2001:559:4a9::/48
  • 2001:559:521::/48
  • 2001:559:57f::/48
  • 2001:559:58c::/48
  • 2001:559:5d8::/48
  • 2001:559:808a::/48
  • 2001:559:8092::/48
  • 2001:559:8137::/48
  • 2001:559:8193::/48
  • 2001:559:821b::/48
  • 2001:559:8282::/48
  • 2001:559:82d4::/48
  • 2001:559:82e8::/48
  • 2001:559:82fe::/48
  • 2001:559:831b::/48
  • 2001:559:8329::/48
  • 2001:559:83a6::/48
  • 2001:559:8443::/48
  • 2001:559:8450::/48
  • 2001:559:8460::/48
  • 2001:559:84a0::/48
  • 2001:559:85e0::/48
  • 2001:559:86b6::/48
  • 2001:559:8782::/48
  • 2001:559:c0ef::/48
  • 2001:559:c154::/48
  • 2001:559:c16d::/48
  • 2001:559:c171::/48
  • 2001:559:c173::/48
  • 2001:559:c285::/48
  • 2001:559:c28a::/48
  • 2001:559:c2e6::/48
  • 2001:559:c348::/48
  • 2001:559:c3f5::/48
  • 2001:559:c493::/48
  • 2001:559:c54c::/48