subnet.im

AS33287Comcast Cable Communications, LLC

United StatesRegistryARIN

As of 26th September 2026, AS33287 (Comcast Cable Communications, LLC), a network registered in the United States with ARIN, originates 46 IPv4 prefixes covering 14.1k addresses and 307 IPv6 prefixes. By IPv4 address space that makes it the 8,773rd-largest of the 79,516 networks we see originating IPv4, and the 2,765th-largest of 18,424 in the United States. It is seen behind 2 upstream networks, most often AS7922 (Comcast Cable Communications, LLC) and AS3356 (Lumen (Level 3)), and in front of 130 downstream networks. 96% of its announcements have a valid RPKI ROA; 1 is RPKI-invalid. 96% of its routes reach at least 90% of full-feed peers, and 14 prefixes are also originated by another network.

At a glance

IPv4 prefixes

46

IPv6 prefixes

307

IPv4 addresses

14.1k

IPv6 /64s

20.1M

Upstream graph

The networks AS33287 is seen behind, one and two hops out, drawn from real AS paths.

AS33287Toward the internet core
Upstream graph for AS33287: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS33287Comcast Cable Com…This networkAS3356Lumen (Level 3)AS7922Comcast Cable Com…AS3549Lumen (fka. Globa…AS2914NTT America, Inc.AS1299Arelion (fka. Tel…

Networks observed one and two hops upstream of AS33287 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

266

adjacent networks

Upstreams
21%
Peers
13450%
Downstreams
13049%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS33287
NetworkCountryRelationshipPathsVantage pts
AS7922Comcast Cable Communications, LLCUSPeer28,156145
AS3356Lumen (Level 3)USPeer4,10459

Prefixes

All 353

The largest blocks AS33287 originates, widest first.

Largest prefixes originated by AS33287
PrefixAddressesVisibility
24.75.216.0/221k81/81
64.52.28.0/221k31/81
31.132.54.0/2351231/81
45.58.210.0/2351231/81
69.91.182.0/2351231/81
24.104.156.0/2425680/81
50.148.139.0/2425680/81
50.148.165.0/2425680/81
50.200.97.0/2425680/81
50.201.53.0/242564/81

Routing health

How AS33287's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid96.3%340
  • Invalid0.3%1
  • No ROA3.4%12

Propagation

  • Globally propagated90% of full-feed peers or more95.8%338
  • Partially propagated40% to 90%0.3%1
  • Seen by few peersUnder 40%4.0%14

Prefix sizes

IPv4 — 46 prefixes

IPv6 — 307 prefixes

  • /4865.5k × /64100.0%307

Recent changes

Announcements that started or stopped since 28th Aug 2026.

  • Announced2001:559:8371::/4826th Sept 2026
  • Withdrawn2001:559:8371::/4826th Sept 2026
  • Withdrawn2001:559:c386::/4825th Sept 2026
  • Announced2001:559:8431::/4824th Sept 2026
  • Withdrawn2001:559:8431::/4822nd Sept 2026
  • Withdrawn2001:559:14a::/4821st Sept 2026
  • Withdrawn2001:559:8376::/4821st Sept 2026
  • Withdrawn2001:559:8415::/4821st Sept 2026
  • Withdrawn2001:559:c31c::/4821st Sept 2026
  • Withdrawn2001:559:c3bc::/4821st Sept 2026

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.