asn.dev

Autonomous system

AS25609 DMC

Unclassified ARIN

IPv4 addresses 51.97K 33 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Detroit Medical Center

United States of America · AI-generated

healthcare business internal

The AS handle DMC is held by Detroit Medical Center.

What it's used for

  • The address space carries internal corporate infrastructure, evidenced by the netname THM36Z-NETWORK1 and registrant Tenet HealthSystem Medical, Inc. across all sampled prefixes.
  • The AS announces 52224 IPv4 addresses across 30 prefixes while maintaining only 2 observed neighbours, a ratio that indicates an internal corporate estate with site-by-site segmentation rather than an access or transit network.

Notable

  • The RDAP registrants for the largest prefixes are consistently Tenet HealthSystem Medical, Inc., which differs from the AS holder name Detroit Medical Center.
  • Tenet HealthSystem acquired Detroit Medical Center, explaining the discrepancy between the AS holder and the RDAP registrants.
  • The inventory consists entirely of IPv4 prefixes within the 155.139.0.0/16 range, with no IPv6 prefixes announced.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

2 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS237Merit Network Inc.979
AS7018AT&T Enterprises, LLC851

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-21, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 33 prefixes · 51.97K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America33

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS25609
Registry name
DMC
Registrant
Detroit Medical Center
Abuse contact
jgarland@dmc.org
Registered
2002-04-08
Last changed
2002-04-08
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 30 with no ROA
ROAs
0 authorising AS25609
ASPA
no ASPA record
IRR
100% registered · 30 of 30 announcements
Route objects
1 naming AS25609

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 1,779 prefixes, as published 2026-10-22. 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

Cross-check