AS12047 — GUNDERSEN-LUTHERAN

AS12047 announces 3 IPv4 prefixes covering 1,280 addresses and 0 IPv6 prefixes.

About this network

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, 204.69.146.0/23 and 204.69.148.0/23 — sit inside the same 204.69.144.0/21 range 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.

Announced prefixes

• 204.69.145.0/24
• 204.69.146.0/23
• 204.69.148.0/23

Upstream networks

• AS40264 Charter Communications LLC
• AS11796 Airstream Communications, LLC

Adjacent networks

• AS40264 Charter Communications LLC
• AS11796 Airstream Communications, LLC