Autonomous system
AS45688 UT-NSRG The University of Tokyo Interfaculty Initiative in Information Studies
Unclassified RIPE
Summary
The University of Tokyo Interfaculty Initiative in Information Studies
education research university
UT-NSRG is operated by The University of Tokyo Interfaculty Initiative in Information Studies.
What it's used for
- The address space is registered under the netname
JPNIC-NET-JP-ERXwith the Japan Network Information Center, indicating standard academic/research infrastructure. - The AS announces 3,592 IPv4 addresses across 5 prefixes, with a single observed neighbour, consistent with a small, self-contained institutional network rather than a transit or access provider.
- Traffic from this AS consists of research, academic, and administrative endpoints associated with the University of Tokyo's Interfaculty Initiative in Information Studies.
Notable
- All registrants for the announced prefixes are listed as the Japan Network Information Center, which aligns with the announcer's identity as a Japanese academic institution.
- The address inventory is finely subdivided into five distinct prefixes, including a /21, a /22, two /24s, and a /29, reflecting internal segmentation of the university's network estate.
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.
Transit providers
1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS2907 | Research Organization of Information and Systems, National Institute of Informatics | 307 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 5 prefixes · 3.59K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 5 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS45688- Registry name
- UT-NSRG
- Abuse contact
- hostmaster@nic.ad.jp
- Registered
- 2009-04-02
- Last changed
- 2012-10-18
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 7 with no ROA
- ROAs
- 0 authorising AS45688
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 7 announcements
- Route objects
- 0 naming AS45688
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
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: 436 networks and 1,771 prefixes, as published 2026-10-13. 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