asn.dev

Autonomous system

AS26305 ASN-SSM - SSM Health Care

Unclassified ARIN

IPv4 addresses 67.58K 10 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

SSM Health

United States of America · AI-generated

healthcare business enterprise us

ASN-SSM is operated by SSM Health, a large Catholic non-profit health system in the United States.

What it's used for

  • The address space is primarily registered under the netname SSMHC-NET with registrant SSM Health Care, indicating an internal corporate network for a healthcare provider.
  • The AS announces 67,584 IPv4 addresses across 10 prefixes and 1 IPv6 prefix, with only 2 observed neighbours, a ratio consistent with an internal corporate estate rather than a transit or access network.

Notable

  • Registrants for the majority of prefixes align with the announcer, identified as SSM Health Care.
  • One prefix, 67.66.136.0/21, is registered to AT&T Enterprises, LLC with netname SBCIS-SIS80, suggesting leased or legacy space within the AS.
  • The inventory is dominated by the 165.104.0.0/16 range, subdivided into multiple smaller blocks, reflecting site-by-site segmentation typical of a large multi-facility organization.

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 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS22677Charter Communications LLC326
AS7018AT&T Enterprises, LLC237

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-08, 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 10 prefixes · 67.58K addresses IPv6 1 prefixes

CountryNamePrefixes
USUnited States of America11

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS26305
Registry name
ASN-SSM
Registrant
SSM Health Care
Abuse contact
ryan.peissig@ssmhealth.com
Registered
2002-08-16
Last changed
2012-03-02
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 10 with no ROA
ROAs
1 authorising AS26305
ASPA
no ASPA record
IRR
90% registered · 9 of 10 announcements
Route objects
3 naming AS26305

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: 455 networks and 1,854 prefixes, as published 2026-11-09. 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