AS25978 — RUSH-EXTERNAL - Rush University Medical Center

AS25978 announces 1 IPv4 prefixes covering 65,536 addresses and 0 IPv6 prefixes.

About this network

RUSH-EXTERNAL is the autonomous system for Rush University Medical Center.

What it's used for

• The address space carries internal corporate traffic for the medical center, evidenced by the consistent netname RUSHNET across all registered prefixes.
• The AS announces 65536 IPv4 addresses across 9 prefixes with only 5 observed neighbours, indicating a finely subdivided internal estate rather than an access or transit network.

Notable

• All registrants in the RDAP data align with the announcer, listing Rush University Medical Center for every prefix.
• The address inventory is concentrated within the 144.74.0.0/17 range, split into nine distinct blocks of varying sizes from /17 down to /23.

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

Announced prefixes

• 144.74.0.0/16

Upstream networks

• AS6461 Zayo Bandwidth
• AS33491 Comcast Cable Communications, LLC
• AS46887 Crown Castle Fiber LLC
• AS701 Verizon Business

Adjacent networks

• AS6461 Zayo Bandwidth
• AS33491 Comcast Cable Communications, LLC
• AS46887 Crown Castle Fiber LLC
• AS701 Verizon Business

Routing security

• RPKI: 0 valid, 0 invalid and 5 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 511 route objects.
• Listed in as-sets: AS-CCF, AS-CCF-TEST, AS-COMCAST-EDIA, AS-PNAPCHG, AS-XO-B.