Autonomous system
AS11350 NORTHWESTERN-MEDICAL-CENTER - NorthWestern Medical Center
Unclassified ARIN
Summary
NorthWestern Medical Center
enterprise legacy
NORTHWESTERN-MEDICAL-CENTER is NorthWestern Medical Center, a community hospital in St. Albans, Vermont. Despite the low AS number this is a recycled ASN — ARIN registered it to the hospital in September 2017 — so it carries no early-internet history.
What it's used for
A single-site healthcare enterprise network. RIS sees one v4 prefix, 256 addresses, no IPv6, and 2 observed neighbours. That is about as small as a routed AS gets: the hospital holds one /24 and multi-homes it across two upstreams. The reason a 256-address organisation bothers with BGP at all is provider independence — clinical systems, electronic health records, imaging exchanges and payer connections cannot tolerate renumbering, and dual upstreams on portable space let the hospital survive one carrier failing without changing an address. Two neighbours confirms it is a leaf network: nothing transits through it.
Notable
The prefix 216.57.112.0/24 is registered to NorthWestern Medical Center itself under the handle NMC-113 — first-party registration with no third-party registrants in the inventory, which rules out any leased-space reading. The addresses sampled returned no reverse DNS, but that is a two-address sample and supports no inference either way.
Interesting
The name invites the obvious confusion with Northwestern Medicine, the large Chicago academic health system. They are unrelated: ARIN puts this holder at 133 Fairfield Street in St. Albans, a Vermont hospital serving Franklin and Grand Isle counties. It is a good example of why a familiar-looking name has to be cleared against the registered address before it is believed.
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 2026-11-05, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 256 addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11350- Registry name
- NORTHWESTERN-MEDICAL-CENTER
- Registrant
- NorthWestern Medical Center
- Abuse contact
- awebster@nmcinc.org
- Registered
- 2017-09-07
- Last changed
- 2017-09-07
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 1 valid, 0 with no ROA
- ROAs
- 1 authorising AS11350
- ASPA
- no ASPA record
- IRR
- 100% registered · 1 of 1 announcements
- Route objects
- 2 naming AS11350
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 1,854 prefixes, as published 2026-11-06. 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