subnet.im

AS33657Comcast Cable Communications, LLC

United StatesRegistryARIN

As of 26th September 2026, AS33657 (Comcast Cable Communications, LLC), a network registered in the United States with ARIN, originates 29 IPv4 prefixes covering 11.5k addresses and 245 IPv6 prefixes. By IPv4 address space that makes it the 9,778th-largest of the 79,516 networks we see originating IPv4, and the 3,022nd-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 132 downstream networks. 96% of its announcements have a valid RPKI ROA; 7 are RPKI-invalid. 97% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

29

IPv6 prefixes

245

IPv4 addresses

11.5k

IPv6 /64s

16.1M

Upstream graph

The networks AS33657 is seen behind, one and two hops out, drawn from real AS paths.

AS33657Toward the internet core
Upstream graph for AS33657: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS33657Comcast 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 AS33657 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

269

adjacent networks

Upstreams
21%
Peers
13550%
Downstreams
13249%

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

Upstreams of AS33657
NetworkCountryRelationshipPathsVantage pts
AS7922Comcast Cable Communications, LLCUSPeer24,871145
AS3356Lumen (Level 3)USPeer3,26460

Prefixes

All 274

The largest blocks AS33657 originates, widest first.

Largest prefixes originated by AS33657
PrefixAddressesVisibility
69.67.80.0/204.1k81/81
192.110.220.0/2351281/81
50.201.252.0/2425680/81
50.202.117.0/2425680/81
50.202.155.0/2425680/81
50.203.251.0/2425680/81
50.204.116.0/2425680/81
50.204.128.0/2425680/81
50.205.74.0/2425680/81
50.207.162.0/2425680/81

Routing health

How AS33657'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

  • Valid95.6%262
  • Invalid2.6%7
  • No ROA1.8%5

Propagation

  • Globally propagated90% of full-feed peers or more97.4%267
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%2.6%7

Prefix sizes

IPv4 — 29 prefixes

IPv6 — 245 prefixes

  • /4865.5k × /64100.0%245

Recent changes

Announcements that started or stopped since 28th Aug 2026.

8 announced and 7 withdrawn in all; the most recent are shown.

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