Autonomous system
AS11197 DART-HITCH
Unclassified ARIN
Summary
Dartmouth-Hitchcock Medical Center
enterprise legacy
DART-HITCH belongs to Dartmouth-Hitchcock Medical Center, the academic medical centre in Lebanon, New Hampshire and the teaching hospital associated with Dartmouth's Geisel School of Medicine. Despite the Dartmouth name, this is the health system's network, not the college's.
What it's used for
Hospital and clinic infrastructure. The AS announces a single IPv4 prefix, the whole 130.189.0.0/16 — 65,536 addresses — registered to the medical centre's own ARIN block (DART-HITCH). No IPv6 is observed, and only two BGP neighbours: a pair of upstreams for redundancy, which is the standard multihomed-enterprise pattern and nothing like a carrier.
A /16 announced flat, with no deaggregation at all, is a strong signal of a single administrative domain rather than a provider carving space up for customers. It carries clinical systems, imaging, staff workstations, remote-access gateways and the public web presence for a health system spanning the main hospital and a network of clinics across New Hampshire and Vermont.
Notable
The address count makes this look like a mid-sized ISP on paper, but the two-neighbour peering estate and the single unbroken /16 say otherwise. This is the case the sweep keeps running into: address volume alone does not identify a role, and the neighbour count is the better discriminator.
No PTRs came back on the two addresses sampled. That is a sample of a /16 and supports no conclusion in either direction about how the reverse zone is delegated.
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 2026-10-20, 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 · 65.54K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11197- Registry name
- DART-HITCH
- Registrant
- Dartmouth-Hitchcock Medical Center
- Abuse contact
- christopher.d.wood@hitchcock.org
- Registered
- 1998-05-14
- Last changed
- 2025-05-05
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 1 with no ROA
- ROAs
- 0 authorising AS11197
- ASPA
- no ASPA record
- IRR
- 100% registered · 1 of 1 announcements
- Route objects
- 1 naming AS11197
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 1,778 prefixes, as published 2026-10-20. 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