subnet.im

AS27451US Oncology, Inc.

United StatesRegistryARIN

As of 27th September 2026, AS27451 (US Oncology, Inc.), a network registered in the United States with ARIN, originates 3 IPv4 prefixes covering 768 addresses. By IPv4 address space that makes it the 44,914th-largest of the 79,525 networks we see originating IPv4, and the 9,395th-largest of 18,428 in the United States. It is seen behind 2 upstream networks, most often AS174 (Cogent Communications, LLC) and AS3356 (Lumen (Level 3)). None of its announcements have a valid RPKI ROA. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

3

IPv6 prefixes

0

IPv4 addresses

768

IPv6 /64s

0

Upstream graph

The networks AS27451 is seen behind, one and two hops out, drawn from real AS paths.

AS27451Toward the internet core
Upstream graph for AS27451: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS27451US Oncology, Inc.This networkAS174Cogent Communicat…AS3356Lumen (Level 3)AS1299Arelion (fka. Tel…AS151326DCConnect Communi…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…

Networks observed one and two hops upstream of AS27451 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

4

adjacent networks

Upstreams
250%
Peers
250%
Downstreams
00%

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

Upstreams of AS27451
NetworkCountryRelationshipPathsVantage pts
AS174Cogent Communications, LLCUSPeer19380
AS3356Lumen (Level 3)USPeer4747

Prefixes

The largest blocks AS27451 originates, widest first.

Largest prefixes originated by AS27451
PrefixAddressesVisibility
38.68.63.0/2425680/81
206.203.80.0/2425680/81
206.203.81.0/2425680/81

Routing health

How AS27451'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%3

Propagation

  • Globally propagated90% of full-feed peers or more100.0%3
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 3 prefixes

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS27451 started or stopped in this period.

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