Autonomous system
AS31 CIT
Unclassified ARIN
Summary
California Institute of Technology (Caltech)
education research university legacy
An early low-numbered allocation (CIT) serving the California Institute of Technology (Caltech) in Pasadena, California.
What it's used for
- Campus, research, and administrative networking for Caltech and its labs.
Notable
- Institutional address space, not commercial hosting or transit.
- The two-digit AS number reflects how early Caltech joined the internet, when numbers were handed out roughly in sequence.
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 2026-10-26, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 15 prefixes · 132K addresses IPv6 3 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 18 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS31- Registry name
- CIT
- Registrant
- California Institute of Technology
- Abuse contact
- noc@caltech.edu
- Registered
- 1984-09-21
- Last changed
- 2023-08-29
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 13 with no ROA
- ROAs
- 0 authorising AS31
- ASPA
- no ASPA record
- IRR
- 92% registered · 12 of 13 announcements 1 other origin
- Route objects
- 9 naming AS31
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: 446 networks and 1,852 prefixes, as published 2026-10-27. 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