Autonomous system
AS15118 SIUMED
Unclassified ARIN
Summary
Southern Illinois University School of Medicine
education research business
A medical school routing two slices of its parent university's address space under its own AS number.
What it's used for
- A medical school's network. Two IPv4
/21blocks announced from the United States, no IPv6, and two observed BGP neighbours.
Notable
- Both blocks are registered to the parent university, not to the school, under the shared netname
SIU-NET. - Both fall inside the same
131.230range that the parent institution's own AS number announces, so one allocation is split across two autonomous systems. - Two of six sampled addresses answered, in the form
ws254.net229.siumed.edu: a host label, then a separate label naming the subnet by its third octet. - That domain is the school's own, distinct from the domain the parent university publishes.
Interesting
- The subnet-as-a-label convention is unusual and useful. Most address-derived names flatten the whole address into one label; this one keeps the network and the host separate, so the name mirrors the structure of the addressing rather than just its digits.
- Two AS numbers over one registered allocation is the interesting shape. The registry sees a single university holding one allocation; routing sees a teaching hospital with its own transit and its own failure domain. Neither view alone describes the institution.
- The school publishes reverse names under its own domain while the addresses stay in the parent's name, so the identity in DNS and the identity in the registry disagree by design.
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 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 4.10K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 2 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS15118- Registry name
- SIUMED
- Registrant
- Southern Illinois University - School of Medicine
- Abuse contact
- abuse@siumed.edu
- Registered
- 2000-03-22
- Last changed
- 2025-01-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 3 valid, 0 with no ROA
- ROAs
- 4 authorising AS15118
- ASPA
- 3 declared providers
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 7 naming AS15118
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 1,783 prefixes, as published 2026-10-17. 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