subnet.im

AS33489Comcast Cable Communications, LLC

United StatesRegistryARIN

As of 26th September 2026, AS33489 (Comcast Cable Communications, LLC), a network registered in the United States with ARIN, originates 10 IPv4 prefixes covering 2.6k addresses and 34 IPv6 prefixes. By IPv4 address space that makes it the 23,020th-largest of the 79,516 networks we see originating IPv4, and the 5,799th-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 21 downstream networks. 93% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

10

IPv6 prefixes

34

IPv4 addresses

2.6k

IPv6 /64s

2.2M

Upstream graph

The networks AS33489 is seen behind, one and two hops out, drawn from real AS paths.

AS33489Toward the internet core
Upstream graph for AS33489: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS33489Comcast 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 AS33489 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

47

adjacent networks

Upstreams
24%
Peers
2451%
Downstreams
2145%

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

Upstreams of AS33489
NetworkCountryRelationshipPathsVantage pts
AS7922Comcast Cable Communications, LLCUSPeer3,590145
AS3356Lumen (Level 3)USPeer36954

Prefixes

All 44

The largest blocks AS33489 originates, widest first.

Largest prefixes originated by AS33489
PrefixAddressesVisibility
50.200.193.0/2425680/81
50.201.41.0/2425680/81
50.202.221.0/2425680/81
50.205.34.0/2425680/81
50.227.73.0/2425680/81
50.230.87.0/2425680/81
50.238.249.0/2425680/81
198.204.31.0/2425681/81
209.12.49.0/2425681/81
216.85.81.0/2425681/81

Routing health

How AS33489'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

  • Valid93.2%41
  • Invalid0.0%0
  • No ROA6.8%3

Propagation

  • Globally propagated90% of full-feed peers or more100.0%44
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 10 prefixes

IPv6 — 34 prefixes

  • /4865.5k × /64100.0%34

Recent changes

Announcements that started or stopped since 28th Aug 2026.

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