subnet.im

AS10367Fibercast Corporation

United StatesRegistryARIN

As of 23rd October 2026, AS10367 (Fibercast Corporation), a network registered in the United States with ARIN, originates 33 IPv4 prefixes covering 24.1k addresses. By IPv4 address space that makes it the 6,373rd-largest of the 79,658 networks we see originating IPv4, and the 2,142nd-largest of 18,483 in the United States. It is seen behind 4 upstream networks, most often AS174 (Cogent Communications, LLC) and AS13536 (FirstLight Networks, LLC). None of its announcements have a valid RPKI ROA. 64% of its routes reach at least 90% of full-feed peers, and 7 prefixes are also originated by another network.

At a glance

IPv4 prefixes

33

IPv6 prefixes

0

IPv4 addresses

24.1k

IPv6 /64s

0

Upstream graph

The networks AS10367 is seen behind, one and two hops out, drawn from real AS paths.

AS10367Toward the internet core
Upstream graph for AS10367: 10 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS10367Fibercast Corpora…This networkAS174Cogent Communicat…AS293ESnetAS6939Hurricane Electri…AS13536FirstLight Networ…AS151326DCConnect Communi…AS2914NTT America, Inc.AS1299Arelion (fka. Tel…AS20130Depaul UniversityAS132337AxclusiveAS3770FirstLight Networ…

Networks observed one and two hops upstream of AS10367 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

12

adjacent networks

Upstreams
433%
Peers
867%
Downstreams
00%

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

Upstreams of AS10367
NetworkCountryRelationshipPathsVantage pts
AS174Cogent Communications, LLCUSPeer1,51871
AS13536FirstLight Networks, LLCUSPeer23177
AS6939Hurricane Electric LLCUSPeer12311
AS293ESnetUSPeer231

Prefixes

All 33

The largest blocks AS10367 originates, widest first.

Largest prefixes originated by AS10367
PrefixAddressesVisibility
216.177.0.0/198.2k36/77
66.211.128.0/204.1k77/77
66.211.144.0/204.1k77/77
199.201.159.0/2425677/77
199.204.194.0/242561/77
199.204.195.0/242561/77
199.204.199.0/2425612/77
208.89.156.0/2425612/77
208.89.158.0/2425612/77
216.177.0.0/2425676/77

Routing health

How AS10367'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

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%33

Propagation

  • Globally propagated90% of full-feed peers or more63.6%21
  • Partially propagated40% to 90%21.2%7
  • Seen by few peersUnder 40%15.2%5

Prefix sizes

IPv4 — 33 prefixes

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS10367 started or stopped in this period.

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