Autonomous system
AS5653 UCSF
Education ARIN
Summary
University of California, San Francisco
education university research legacy
The campus network of the University of California, San Francisco (UCSF), a health-sciences university and academic medical centre, registered under the handle UCSF.
What it's used for
- Connectivity for UCSF's schools of medicine, dentistry, nursing, and pharmacy, its graduate research programmes, and the UCSF Medical Center.
- Routing for roughly 196,000 IPv4 addresses spread across campus, research, and clinical networks.
Notable
- Institutional address space with a research-university profile. It carries academic, laboratory, and clinical systems rather than commercial hosting.
- ARIN registered the AS in 1995, part of the wave of US universities that took their own AS numbers as campus networks joined the commercial internet.
Interesting
- UCSF is the one University of California campus with no undergraduate programme. It is entirely graduate and professional, and the network reflects that: a large teaching hospital sits behind it alongside the academic campus, which is why the address space is so much larger than a college of comparable enrolment would hold.
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 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 49 prefixes · 196K addresses IPv6 3 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 52 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS5653- Registry name
- UCSF
- Registrant
- University of California San Francisco
- Abuse contact
- security@ucsf.edu
- Registered
- 1995-07-27
- Last changed
- 2026-02-26
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 17 with no ROA
- ROAs
- 0 authorising AS5653
- ASPA
- no ASPA record
- IRR
- 100% registered · 17 of 17 announcements
- Route objects
- 5 naming AS5653
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 1,772 prefixes, as published 2026-10-15. 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