Autonomous System

AS4 University of Southern California

EducationActiveUnited StatesARIN

AS4 (ISI-AS) is an education network operated by University of Southern California in United States, registered with ARIN. It has 40 IPv4 prefixes with 68,864 addresses and 7 IPv6 prefixes, which makes it the 3,067th largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses68,864in 40 prefixes
IPv6 prefixes7≈ 1.6 × 10²⁹ addresses
Size rank#3,067of 82,200 active ASNs
Abuser scoreVery Low0.01% of its addresses flagged · method

Details

OrganizationUniversity of Southern California
AS nameISI-AS
Websiteusc.edu
Country United States (US)
Network typeEducation
RegistryARIN
Abuse contactaction@isi.edu
Registered1984-02-22
Last updated2023-09-29

IPv4 prefixes

40 prefixes · 68,864 addresses
NetworkAddressesFirst – last address
128.9.192.0/1816,384128.9.192.0 – 128.9.255.255
128.9.0.0/204,096128.9.0.0 – 128.9.15.255
128.9.32.0/204,096128.9.32.0 – 128.9.47.255
128.9.48.0/204,096128.9.48.0 – 128.9.63.255
128.9.64.0/204,096128.9.64.0 – 128.9.79.255
128.9.80.0/204,096128.9.80.0 – 128.9.95.255
128.9.96.0/204,096128.9.96.0 – 128.9.111.255
128.9.112.0/204,096128.9.112.0 – 128.9.127.255
128.9.128.0/204,096128.9.128.0 – 128.9.143.255
128.9.144.0/204,096128.9.144.0 – 128.9.159.255
128.9.160.0/204,096128.9.160.0 – 128.9.175.255
128.9.176.0/204,096128.9.176.0 – 128.9.191.255
128.9.28.0/23512128.9.28.0 – 128.9.29.255
128.9.16.0/24256128.9.16.0 – 128.9.16.255
128.9.17.0/24256128.9.17.0 – 128.9.17.255
128.9.18.0/24256128.9.18.0 – 128.9.18.255
128.9.19.0/24256128.9.19.0 – 128.9.19.255
128.9.26.0/24256128.9.26.0 – 128.9.26.255
128.9.30.0/24256128.9.30.0 – 128.9.30.255
128.9.31.0/24256128.9.31.0 – 128.9.31.255
128.9.34.0/24256128.9.34.0 – 128.9.34.255
128.9.35.0/24256128.9.35.0 – 128.9.35.255
128.9.36.0/24256128.9.36.0 – 128.9.36.255
128.9.37.0/24256128.9.37.0 – 128.9.37.255
128.9.38.0/24256128.9.38.0 – 128.9.38.255
The 25 largest of 40. The API and the database have all of them.

IPv6 prefixes

7 prefixes
  • 2606:d5c0::/32
  • 2804:3edc::/32
  • 2001:500:202::/48
  • 2001:1878:401::/48
  • 2001:1878:402::/48
  • 2001:1878:403::/48
  • 2001:1878:404::/48

Query AS4 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=AS4&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS4, with or without a key:

curl "https://api.ipapi.is/?q=128.9.192.1"

Other networks of University of Southern California

AS47 University of Southern California71,680 IPv4 addresses

Largest networks in United States

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