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AS33651Comcast Cable Communications, LLC

United StatesRegistryARIN

As of 26th September 2026, AS33651 (Comcast Cable Communications, LLC), a network registered in the United States with ARIN, originates 107 IPv4 prefixes covering 83.5k addresses and 187 IPv6 prefixes. By IPv4 address space that makes it the 2,681st-largest of the 79,516 networks we see originating IPv4, and the 851st-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 152 downstream networks. 94% of its announcements have a valid RPKI ROA; 7 are RPKI-invalid. 82% of its routes reach at least 90% of full-feed peers, and 56 prefixes are also originated by another network.

At a glance

IPv4 prefixes

107

IPv6 prefixes

187

IPv4 addresses

83.5k

IPv6 /64s

34.4B

Upstream graph

The networks AS33651 is seen behind, one and two hops out, drawn from real AS paths.

AS33651Toward the internet core
Upstream graph for AS33651: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS33651Comcast 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 AS33651 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

327

adjacent networks

Upstreams
21%
Peers
17353%
Downstreams
15246%

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

Upstreams of AS33651
NetworkCountryRelationshipPathsVantage pts
AS7922Comcast Cable Communications, LLCUSPeer25,054145
AS3356Lumen (Level 3)USPeer78732

Prefixes

All 294

The largest blocks AS33651 originates, widest first.

Largest prefixes originated by AS33651
PrefixAddressesVisibility
140.89.64.0/1816.4k50/81
9.142.96.0/198.2k8/81
135.132.64.0/198.2k8/81
9.142.48.0/204.1k8/81
138.226.64.0/204.1k8/81
64.84.96.0/212k81/81
64.84.120.0/212k81/81
138.226.48.0/212k8/81
138.226.112.0/212k8/81
138.226.192.0/212k79/81

Routing health

How AS33651'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

  • Valid94.2%277
  • Invalid2.4%7
  • No ROA3.4%10

Propagation

  • Globally propagated90% of full-feed peers or more82.3%242
  • Partially propagated40% to 90%7.5%22
  • Seen by few peersUnder 40%10.2%30

Prefix sizes

IPv4 — 107 prefixes

IPv6 — 187 prefixes

  • /2934.4B × /640.5%1
  • /441M × /640.5%1
  • /4865.5k × /6498.9%185

Recent changes

Announcements that started or stopped since 27th Aug 2026.

13 announced and 8 withdrawn in all; the most recent are shown.

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