subnet.im

AS7725Comcast Cable Communications, LLC

United StatesRegistryARIN

As of 26th September 2026, AS7725 (Comcast Cable Communications, LLC), a network registered in the United States with ARIN, originates 32 IPv4 prefixes covering 10.5k addresses and 113 IPv6 prefixes. By IPv4 address space that makes it the 10,196th-largest of the 79,480 networks we see originating IPv4, and the 3,126th-largest of 18,421 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 65 downstream networks. 94% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. Over 99% of its routes reach at least 90% of full-feed peers, and 1 prefix is also originated by another network.

At a glance

IPv4 prefixes

32

IPv6 prefixes

113

IPv4 addresses

10.5k

IPv6 /64s

281T

Upstream graph

The networks AS7725 is seen behind, one and two hops out, drawn from real AS paths.

AS7725Toward the internet core
Upstream graph for AS7725: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS7725Comcast 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 AS7725 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

134

adjacent networks

Upstreams
21%
Peers
6750%
Downstreams
6549%

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

Upstreams of AS7725
NetworkCountryRelationshipPathsVantage pts
AS7922Comcast Cable Communications, LLCUSPeer13,010144
AS3356Lumen (Level 3)USPeer1,76054

Prefixes

All 145

The largest blocks AS7725 originates, widest first.

Largest prefixes originated by AS7725
PrefixAddressesVisibility
2002::/16281T × /641/64
72.162.44.0/221k81/81
50.205.36.0/2351280/81
50.224.48.0/2351279/81
72.162.12.0/2351281/81
72.162.48.0/2351281/81
72.162.100.0/2351281/81
205.167.158.0/2351281/81
24.104.42.0/2425680/81
24.104.125.0/2425680/81

Routing health

How AS7725'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

  • Valid94.5%137
  • Invalid0.0%0
  • No ROA5.5%8

Propagation

  • Globally propagated90% of full-feed peers or more99.3%144
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.7%1

Prefix sizes

IPv4 — 32 prefixes

IPv6 — 113 prefixes

  • /16281T × /640.9%1
  • /4865.5k × /6499.1%112

Recent changes

Announcements that started or stopped since 27th Aug 2026.

  • Withdrawn2001:559:82d2::/4821st Sept 2026
  • Withdrawn2001:559:845c::/4821st Sept 2026
  • Withdrawn2001:559:8775::/4821st Sept 2026

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