Autonomous system
AS12047 GUNDERSEN-LUTHERAN
Unclassified ARIN
Summary
Gundersen Lutheran Medical Center
healthcare enterprise legacy
The network of Gundersen, the hospital and clinic system based in La Crosse, Wisconsin.
What it's used for
- Hospital and clinic systems. 1,280 addresses over three prefixes with two observed BGP neighbours, no IPv6 announced.
Notable
- All three blocks —
204.69.145.0/24,204.69.146.0/23and204.69.148.0/23— sit inside the same204.69.144.0/21range and share one netname,GUNDERSEN-LUTHERAN. - Announcing three pieces of one contiguous range rather than the covering block leaves the unused parts out of the routing table.
- First seen in the routing data in February 2007.
Interesting
- A regional health system with two upstreams and no IPv6 is the ordinary shape of hospital networking. The AS exists so that clinics, imaging systems and records keep working when one circuit fails, not because anyone wanted to be on the internet in an interesting way.
- Gundersen became known for two things outside medicine. It ran an advance-care-planning programme that made La Crosse County one of the places where nearly every adult has written down their end-of-life wishes, and it spent years buying wind, biogas and efficiency until it was generating more energy than it consumed. Neither shows up in a routing table, which is worth remembering about what a routing table can tell you.
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 2026-10-31, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 3 prefixes · 1.28K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 3 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS12047- Registry name
- GUNDERSEN-LUTHERAN
- Registrant
- Gundersen Lutheran Medical Center, Inc.
- Abuse contact
- scwied@gundersenhealth.org
- Registered
- 2007-01-03
- Last changed
- 2014-04-04
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 5 with no ROA
- ROAs
- 0 authorising AS12047
- ASPA
- no ASPA record
- IRR
- 60% registered · 3 of 5 announcements
- Route objects
- 2 naming AS12047
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: 447 networks and 1,845 prefixes, as published 2026-10-31. 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