AS12099 — OAKWOOD-HEALTHCARE

AS12099 announces 9 IPv4 prefixes covering 66,304 addresses and 0 IPv6 prefixes.

About this network

A hospital network in the Detroit metro area, originally Oakwood Healthcare of Dearborn and since merged into a much larger Michigan health system.

What it's used for

• Internal networking for hospitals and clinics: clinical systems, imaging, administration and the corporate estate behind them.

Notable

• Eight of the nine announced prefixes are registered not to Oakwood but to William Beaumont Hospital, under the netname WMBEAUNET. Oakwood and Beaumont combined in 2014 to form Beaumont Health, which in turn merged with Spectrum Health in 2022 to become Corewell Health, so the AS handle, the netnames and the operating company are three different generations of the same organisation.
• 66,000 addresses over nine prefixes with only two observed BGP neighbours. Hospital networks are end sites by design — large internal estates with a very small external surface.
• No IPv6 announced.

Interesting

• US healthcare consolidation is legible in address registries long before it is anywhere else. Nobody renumbers a hospital to match a merger, so the paperwork accumulates a layer for each deal while the network underneath keeps running.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 162.82.0.0/17
• 162.82.128.0/18
• 162.82.192.0/19
• 162.82.224.0/20
• 162.82.240.0/21
• 162.82.248.0/22
• 162.82.252.0/23
• 162.82.255.0/24
• 208.90.92.0/22

Upstream networks

• AS26554 US Signal Company, L.L.C.
• AS46887 Crown Castle Fiber LLC

Adjacent networks

• AS26554 US Signal Company, L.L.C.
• AS46887 Crown Castle Fiber LLC