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AS33490Comcast (Portland/Spokane)

United StatesRegistryARINTypeEyeball

As of 26th September 2026, AS33490 (Comcast (Portland/Spokane)), an access network registered in the United States with ARIN, originates 37 IPv4 prefixes covering 16.4k addresses and 60 IPv6 prefixes. By IPv4 address space that makes it the 7,959th-largest of the 79,516 networks we see originating IPv4, and the 2,553rd-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 63 downstream networks. 70% of its announcements have a valid RPKI ROA; 15 are RPKI-invalid. 85% of its routes reach at least 90% of full-feed peers, and 2 prefixes are also originated by another network.

At a glance

IPv4 prefixes

37

IPv6 prefixes

60

IPv4 addresses

16.4k

IPv6 /64s

3.9M

Upstream graph

The networks AS33490 is seen behind, one and two hops out, drawn from real AS paths.

AS33490Toward the internet core
Upstream graph for AS33490: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS33490Comcast (Portland…This networkAS3356Lumen (Level 3)AS7922Comcast Cable Com…AS3549Lumen (fka. Globa…AS2914NTT America, Inc.AS1299Arelion (fka. Tel…

Networks observed one and two hops upstream of AS33490 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

132

adjacent networks

Upstreams
22%
Peers
6751%
Downstreams
6348%

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

Upstreams of AS33490
NetworkCountryRelationshipPathsVantage pts
AS7922Comcast Cable Communications, LLCUSPeer9,671145
AS3356Lumen (Level 3)USPeer1,88259

Prefixes

All 97

The largest blocks AS33490 originates, widest first.

Largest prefixes originated by AS33490
PrefixAddressesVisibility
104.145.48.0/204.1k81/81
74.50.12.0/221k81/81
216.122.120.0/221k81/81
216.122.124.0/221k81/81
104.247.154.0/235124/81
173.211.82.0/235121/81
204.76.180.0/2351281/81
50.204.255.0/2425680/81
50.206.113.0/2425680/81
50.228.52.0/2425680/81

Routing health

How AS33490'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

  • Valid70.1%68
  • Invalid15.5%15
  • No ROA14.4%14

Propagation

  • Globally propagated90% of full-feed peers or more84.5%82
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%15.5%15

Prefix sizes

IPv4 — 37 prefixes

IPv6 — 60 prefixes

  • /4865.5k × /64100.0%60

Recent changes

Announcements that started or stopped since 27th Aug 2026.

No announcement by AS33490 started or stopped in this period.

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