Autonomous System

AS25978 Rush University Medical Center

BusinessActiveUnited StatesARIN

AS25978 (RUSH-EXTERNAL) is a business network operated by Rush University Medical Center in United States, registered with ARIN. It has 5 IPv4 prefixes with 68,608 addresses, which makes it the 3,090th largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses68,608in 5 prefixes
IPv6 prefixes0none
Size rank#3,090of 82,200 active ASNs
Abuser scoreVery Lowunder 0.01% of its addresses flagged · method

Details

OrganizationRush University Medical Center
AS nameRUSH-EXTERNAL
Websiterush.edu
Country United States (US)
Network typeBusiness
RegistryARIN
Abuse contactkoder@rush.edu
Registered2025-02-19
Last updated2025-02-19

IPv4 prefixes

5 prefixes · 68,608 addresses
NetworkAddressesFirst – last address
144.74.0.0/1732,768144.74.0.0 – 144.74.127.255
144.74.128.0/1732,768144.74.128.0 – 144.74.255.255
144.74.16.0/212,048144.74.16.0 – 144.74.23.255
144.74.16.0/23512144.74.16.0 – 144.74.17.255
144.74.20.0/23512144.74.20.0 – 144.74.21.255

IPv6 prefixes

No IPv6 prefixes.

Query AS25978 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS25978&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS25978, with or without a key:

curl "https://api.ipapi.is/?q=144.74.0.1"

Largest networks in United States

AS749 United States Department of Defense (DoD)227,464,192 IPv4 addressesAS16509 Amazon.com, Inc.218,038,784 IPv4 addressesAS7018 AT&T Enterprises, LLC117,262,080 IPv4 addressesAS8075 Microsoft Corporation81,463,040 IPv4 addressesAS721 United States Department of Defense (DoD)73,070,080 IPv4 addressesAS7922 Comcast Cable Communications, LLC68,336,896 IPv4 addresses