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AS7377University of California, San Diego

United StatesRegistryARINTypeEyeball

As of 26th September 2026, AS7377 (University of California, San Diego), an access network registered in the United States with ARIN, originates 18 IPv4 prefixes covering 12.9M addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 59th-largest of the 79,516 networks we see originating IPv4, and the 20th-largest of 18,424 in the United States. It is seen behind 2 upstream networks, most often AS2152 (CENIC - CalREN) and AS2153 (CENIC), and in front of 1 downstream network. 30% of its announcements have 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

18

IPv6 prefixes

2

IPv4 addresses

12.9M

IPv6 /64s

5.4B

Upstream graph

The networks AS7377 is seen behind, one and two hops out, drawn from real AS paths.

AS7377Toward the internet core
Upstream graph for AS7377: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS7377University of Cal…This networkAS2152CENIC - CalRENAS2153CENICAS3356Lumen (Level 3)AS6939Hurricane Electri…AS293ESnet

Networks observed one and two hops upstream of AS7377 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

7

adjacent networks

Upstreams
229%
Peers
457%
Downstreams
114%

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

Upstreams of AS7377
NetworkCountryRelationshipPathsVantage pts
AS2152CENIC - CalRENUSPeer1,646143
AS2153CENICUSPeer161

Prefixes

The largest blocks AS7377 originates, widest first.

Largest prefixes originated by AS7377
PrefixAddressesVisibility
44.0.0.0/98.4M80/81
44.128.0.0/104.2M80/81
128.54.0.0/1665.5k81/81
132.239.0.0/1665.5k81/81
137.110.0.0/1665.5k81/81
169.228.0.0/1665.5k81/81
69.196.32.0/198.2k81/81
69.196.32.0/204.1k81/81
69.166.11.0/2425681/81
69.196.40.0/2425681/81

Routing health

How AS7377'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

  • Valid30.0%6
  • Invalid0.0%0
  • No ROA70.0%14

Propagation

  • Globally propagated90% of full-feed peers or more100.0%20
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 18 prefixes

IPv6 — 2 prefixes

  • /324.3B × /6450.0%1
  • /341.1B × /6450.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS7377 started or stopped in this period.

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