subnet.im

AS393689National Library of Medicine

United StatesRegistryARIN

As of 23rd October 2026, AS393689 (National Library of Medicine), a network registered in the United States with ARIN, originates 4 IPv4 prefixes covering 2.3k addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 24,123rd-largest of the 79,652 networks we see originating IPv4, and the 6,045th-largest of 18,475 in the United States. It is seen behind 4 upstream networks, most often AS10886 (University of Maryland) and AS11164 (Internet2 I2PX). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

4

IPv6 prefixes

1

IPv4 addresses

2.3k

IPv6 /64s

65.5k

Upstream graph

The networks AS393689 is seen behind, one and two hops out, drawn from real AS paths.

AS393689Toward the internet core
Upstream graph for AS393689: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS393689National Library …This networkAS70National Library …AS10886University of Mar…AS11164Internet2 I2PXAS11537Internet2AS19050U.S. Department o…AS1299Arelion (fka. Tel…AS6461Zayo BandwidthAS2152CENIC - CalRENAS2497Internet Initiati…AS293ESnetAS2153CENIC

Networks observed one and two hops upstream of AS393689 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

8

adjacent networks

Upstreams
450%
Peers
450%
Downstreams
00%

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

Upstreams of AS393689
NetworkCountryRelationshipPathsVantage pts
AS10886University of MarylandUSPeer304115
AS11164Internet2 I2PXUSPeer5522
AS70National Library of MedicineUSPeer41
AS11537Internet2USPeer41

Prefixes

The largest blocks AS393689 originates, widest first.

Largest prefixes originated by AS393689
PrefixAddressesVisibility
165.112.8.0/221k76/77
165.112.6.0/2351276/77
165.112.34.0/2351276/77
165.112.140.0/2425676/77
2607:f220:41f::/4865.5k × /6463/64

Routing health

How AS393689'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

  • Valid100.0%5
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%5
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 4 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

No announcement by AS393689 started or stopped in this period.

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