Autonomous system
AS25978 RUSH-EXTERNAL - Rush University Medical Center
Unclassified ARIN
Summary
Rush University Medical Center
healthcare business academic internal
RUSH-EXTERNAL is the autonomous system for Rush University Medical Center.
What it's used for
- The address space carries internal corporate traffic for the medical center, evidenced by the consistent netname
RUSHNETacross all registered prefixes. - The AS announces 65536 IPv4 addresses across 9 prefixes with only 5 observed neighbours, indicating a finely subdivided internal estate rather than an access or transit network.
Notable
- All registrants in the RDAP data align with the announcer, listing Rush University Medical Center for every prefix.
- The address inventory is concentrated within the 144.74.0.0/17 range, split into nine distinct blocks of varying sizes from /17 down to /23.
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 2026-11-07, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 9 prefixes · 65.54K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 9 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS25978- Registry name
- RUSH-EXTERNAL
- Registrant
- Rush University Medical Center
- Abuse contact
- koder@rush.edu
- Registered
- 2025-02-19
- Last changed
- 2025-02-19
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 5 with no ROA
- ROAs
- 0 authorising AS25978
- ASPA
- no ASPA record
- IRR
- 100% registered · 5 of 5 announcements
- Route objects
- 511 naming AS25978
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: 454 networks and 1,852 prefixes, as published 2026-11-08. 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