Autonomous system
AS2501 UTNET The University of Tokyo
Education ARIN
Summary
The University of Tokyo
education university research legacy
UTNET is the campus network of the University of Tokyo (Todai), Japan's oldest and most prominent national university.
What it's used for
- Campus, research, and administrative networking across the university's Tokyo campuses.
Notable
- An institutional research-university network, not a commercial ISP or host. The low AS number reflects an early Japanese-internet allocation from the 1990s.
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 2026-10-20, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4 prefixes · 201K addresses IPv6 16 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 20 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS2501- Registry name
- UTnet
- Registered
- 2002-04-05
- Last changed
- 2014-03-19
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 6 with no ROA
- ROAs
- 0 authorising AS2501
- ASPA
- no ASPA record
- IRR
- 100% registered · 6 of 6 announcements
- Route objects
- 7 naming AS2501
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 1,778 prefixes, as published 2026-10-20. 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