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AS1201Old Dominion University

United StatesRegistryARIN

As of 22nd October 2026, AS1201 (Old Dominion University), a network registered in the United States with ARIN, originates 33 IPv4 prefixes covering 328k addresses. By IPv4 address space that makes it the 928th-largest of the 79,655 networks we see originating IPv4, and the 241st-largest of 18,475 in the United States. It is seen behind 2 upstream networks, most often AS40220 (Virginia Polytechnic Institute and…) and AS22773 (Cox Communications Inc.). None of its announcements have a valid RPKI ROA. 76% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

33

IPv6 prefixes

0

IPv4 addresses

328k

IPv6 /64s

0

Upstream graph

The networks AS1201 is seen behind, one and two hops out, drawn from real AS paths.

AS1201Toward the internet core
Upstream graph for AS1201: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS1201Old Dominion Univ…This networkAS22773Cox Communication…AS40220Virginia Polytech…AS1299Arelion (fka. Tel…AS3257GTT Communication…AS174Cogent Communicat…AS11164Internet2 I2PX

Networks observed one and two hops upstream of AS1201 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

5

adjacent networks

Upstreams
240%
Peers
360%
Downstreams
00%

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

Upstreams of AS1201
NetworkCountryRelationshipPathsVantage pts
AS40220Virginia Polytechnic Institute and State Univ.USPeer1,58177
AS22773Cox Communications Inc.USPeer55857

Prefixes

All 33

The largest blocks AS1201 originates, widest first.

Largest prefixes originated by AS1201
PrefixAddressesVisibility
128.82.0.0/1665.5k76/77
157.21.0.0/1665.5k76/77
128.82.128.0/1732.8k77/77
157.21.0.0/1732.8k23/77
157.21.128.0/1732.8k23/77
128.82.64.0/1816.4k77/77
157.21.0.0/1816.4k35/77
157.21.64.0/1816.4k35/77
157.21.128.0/1816.4k35/77
157.21.192.0/1816.4k35/77

Routing health

How AS1201'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 more75.8%25
  • Partially propagated40% to 90%12.1%4
  • Seen by few peersUnder 40%12.1%4

Prefix sizes

IPv4 — 33 prefixes

Recent changes

Announcements that started or stopped since 22nd Sept 2026.

No announcement by AS1201 started or stopped in this period.

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