Autonomous system
AS23237 MCMASTER
Unclassified ARIN
Summary
McMaster University
education university research canada
The AS handle MCMASTER is operated by McMaster University.
What it's used for
- The address space is registered under netnames
MCMASTER,MACPHYS, andMACENG, all attributed to McMaster University, indicating a dedicated institutional network. - The AS announces 66,048 IPv4 addresses across 10 prefixes and 1 IPv6 prefix, while maintaining only 2 observed routing neighbours, a ratio characteristic of an isolated academic or research network rather than a transit provider.
Notable
- All registrants in the evidence pack consistently identify McMaster University, aligning perfectly with the AS holder.
- The address inventory is finely subdivided into multiple prefixes within the 130.113.0.0/16 range, alongside two smaller /24 blocks, reflecting internal site-by-site segmentation typical of a large campus 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.
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 10 prefixes · 66.05K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| CA | Canada | 11 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS23237- Registry name
- MCMASTER
- Registrant
- McMaster University
- Abuse contact
- mike.diggins@mcmaster.ca
- Registered
- 2002-02-13
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 5 with no ROA
- ROAs
- 0 authorising AS23237
- ASPA
- no ASPA record
- IRR
- 100% registered · 5 of 5 announcements
- Route objects
- 5 naming AS23237
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: 442 networks and 1,773 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