Autonomous system
AS7377 UCSD
Education ARIN
Summary
University of California, San Diego
education research legacy
UCSD is the University of California, San Diego, a major public research university and the home of the San Diego Supercomputer Center. AS7377 is its campus network.
What it's used for
- Campus connectivity for students, staff, labs and research groups across four legacy Class B blocks:
128.54.0.0/16,132.239.0.0/16,137.110.0.0/16and169.228.0.0/16, plus an IPv62607:f720::/32. - Reverse DNS is institutional throughout, with names like
agg-vss-1-vlan2-gw.ucsd.edufor campus aggregation routers and per-department zones such assysnet.ucsd.edufor the computer-science research groups. There is no subscriber-style addressing anywhere.
Notable
- This is university address space, not consumer or commercial space. Traffic from it is far more likely to be a lab machine, a research measurement host, or a student on campus Wi-Fi than a home broadband user.
- ARIN registered the ASN in November 1996. The
-Zsuffix on the university's org handle is an ARIN legacy-cleanup artefact, not a sign the number changed hands.
Interesting
- AS7377 announces
44.0.0.0/9and44.128.0.0/10: the AMPRNet amateur-radio address space, held by Amateur Radio Digital Communications (ARDC). ARDC's internet gateway has long been hosted at UCSD as part of a research project, so the university's AS carries an enormous block of addresses that belong to the worldwide ham-radio community rather than to the campus. - Those two blocks account for the great majority of the IPv4 addresses attributed to this ASN. Its actual campus footprint is roughly a quarter of a million addresses.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 779 prefixes · 12.13M addresses IPv6 34 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 813 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS7377- Registry name
- UCSD
- Registrant
- University of California, San Diego
- Abuse contact
- network-abuse@ucsd.edu
- Registered
- 1996-11-25
- Last changed
- 2023-12-19
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 30% valid · 6 valid, 14 with no ROA
- ROAs
- 6 authorising AS7377
- ASPA
- no ASPA record
- IRR
- 100% registered · 20 of 20 announcements
- Route objects
- 29 naming AS7377
Reputation
Classification and threat
Education University, school or national research and education network.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,782 prefixes, as published 2026-10-16. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere