AS12250 — EHSC - EDWARD HEALTH SERVICE CORP

AS12250 announces 4 IPv4 prefixes covering 1,280 addresses and 0 IPv6 prefixes.

About this network

The network of Edward Hospital and its associated health services in the western suburbs of Chicago.

What it's used for

• Hospital and clinic systems. 1,280 addresses over four prefixes with two observed BGP neighbours, no IPv6 announced.

Notable

• Four prefixes carry four carriers' fingerprints. EEH-PUBIP is the hospital's own; CCCH3-4 is Comcast's; SBC-65-42-192-0-24-0708070819 is SBC's, with a ten-digit stamp on the end; and Q0605-216-207-220-0 carries the Q prefix and a 0605 date that Qwest used on its assignments.
• Reverse DNS matches the split. One block answers under ded.ameritech.net, the "dedicated" space of SBC's midwestern brand; another answers under edward.org, the hospital's own domain.

Interesting

• This is what a hospital's procurement history looks like from the outside. Four blocks from four different providers, each labelled in that provider's house style, all announced under one AS number so the hospital can change any of them without renumbering anything.
• The Comcast netname CCCH3-4 also turns up on a block announced by Ascensus at AS12152. It is not a customer identifier at all — it labels a Comcast pool that assignments are cut from, so the same string appears across unrelated businesses. Netnames look like names and are frequently nothing of the kind.

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

Announced prefixes

• 45.59.156.0/23
• 50.236.144.0/24
• 65.42.192.0/24
• 216.207.220.0/24

Upstream networks

• AS7018 AT&T Enterprises, LLC
• AS33491 Comcast Cable Communications, LLC

Adjacent networks

• AS7018 AT&T Enterprises, LLC
• AS33491 Comcast Cable Communications, LLC

Routing security

• RPKI: 1 valid, 0 invalid and 4 not-found announcements; 1 ROAs.
• ASPA: none published.
• IRR: 40% of announcements registered; 2 route objects.
• Listed in as-sets: AS-COMCAST-EDIA.