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AS40387University of Illinois

United StatesRegistryARIN

As of 23rd October 2026, AS40387 (University of Illinois), a network registered in the United States with ARIN, originates 1 IPv4 prefix covering 2k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 25,336th-largest of the 79,659 networks we see originating IPv4, and the 6,308th-largest of 18,482 in the United States. It is seen behind 7 upstream networks, most often AS23473 (PAVLOV MEDIA INC) and AS1299 (Arelion (fka. Telia Carrier)), and in front of 7 downstream networks. 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

1

IPv6 prefixes

1

IPv4 addresses

2k

IPv6 /64s

65.5k

Upstream graph

The networks AS40387 is seen behind, one and two hops out, drawn from real AS paths.

AS40387Toward the internet core
Upstream graph for AS40387: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS40387University of Ill…This networkAS293ESnetAS1299Arelion (fka. Tel…AS2381WiscNetAS11164Internet2 I2PXAS23473PAVLOV MEDIA INCAS13030Init7 (Switzerlan…AS16552Tiggee LLCAS2914NTT America, Inc.AS6939Hurricane Electri…AS2152CENIC - CalRENAS2497Internet Initiati…

Networks observed one and two hops upstream of AS40387 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

40

adjacent networks

Upstreams
718%
Peers
2665%
Downstreams
718%

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

Upstreams of AS40387
NetworkCountryRelationshipPathsVantage pts
AS23473PAVLOV MEDIA INCUSPeer79988
AS1299Arelion (fka. Telia Carrier)SEPeer70759
AS2381WiscNetUSPeer21521
AS11164Internet2 I2PXUSPeer476
AS293ESnetUSPeer151
AS11537Internet2USPeer141
AS22335Metropolitan Research and Education NetworkUSPeer22

Prefixes

The largest blocks AS40387 originates, widest first.

Largest prefixes originated by AS40387
PrefixAddressesVisibility
72.36.120.0/212k77/77
2620:0:e10::/4865.5k × /6464/64

Routing health

How AS40387'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%2

Propagation

  • Globally propagated90% of full-feed peers or more100.0%2
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 1 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS40387 started or stopped in this period.

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