Country
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ASN LANDING PAGE
AS4
ISI-AS - University of Southern California
Last updated · Jul 20, 2026
Total prefixes
54
IPv4 prefixes
47
IPv6 prefixes
7
ASN summary
How to read the scale of AS4
ISI-AS - University of Southern California currently reports 54 prefixes and 15 upstream, downstream, or peer relationships. These counts describe the current dataset; they do not by themselves prove network quality, reach, or service use.
What can an ASN page answer?
An ASN page shows the public organization label, country or region, BGP prefixes, and available peer and upstream relationships. It adds network context but cannot confirm a website host, physical facility, security status, or service quality.
How should you read the organization and region fields?
ISI-AS - University of Southern California is currently associated with an unknown region. These values come from public network sources and are useful lookup clues; an organization label, registration region, and actual service location may differ.
How should you verify the AS4 result?
The page shows ASN data returned by the current upstream query; interpret it with the update time. Open representative IP pages from the same network and compare prefixes, source labels, and query times. Verify operator or service claims with the relevant registry or network operator.
How to verify this ASN result
AS4 ASN lookupAS4 BGPAS4 peersAS4 prefixesAS4 upstreamsISI-AS - University of Southern California ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
Peers
Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 128.9.0.0/20 | AS4 | — |
| 128.9.112.0/20 | AS4 | — |
| 128.9.113.0/24 | AS4 | — |
| 128.9.117.0/24 | AS4 | — |
| 128.9.122.0/24 | AS4 | — |
| 128.9.123.0/24 | AS4 | — |
| 128.9.127.0/24 | AS4 | — |
| 128.9.128.0/20 | AS4 | — |
| 128.9.144.0/20 | AS4 | — |
| 128.9.16.0/24 | AS4 | — |
| 128.9.160.0/20 | AS4 | — |
| 128.9.17.0/24 | AS4 | — |
| 128.9.176.0/20 | AS4 | — |
| 128.9.18.0/24 | AS4 | — |
| 128.9.19.0/24 | AS4 | — |
| 128.9.192.0/18 | AS4 | — |
| 128.9.26.0/24 | AS4 | — |
| 128.9.28.0/23 | AS4 | — |
| 128.9.30.0/24 | AS4 | — |
| 128.9.31.0/24 | AS4 | — |
| 128.9.32.0/20 | AS4 | — |
| 128.9.34.0/24 | AS4 | — |
| 128.9.35.0/24 | AS4 | — |
| 128.9.36.0/24 | AS4 | — |
| 128.9.37.0/24 | AS4 | — |
| 128.9.38.0/24 | AS4 | — |
| 128.9.40.0/24 | AS4 | — |
| 128.9.43.0/24 | AS4 | — |
| 128.9.44.0/24 | AS4 | — |
| 128.9.46.0/24 | AS4 | — |
| 128.9.47.0/24 | AS4 | — |
| 128.9.48.0/20 | AS4 | — |
| 128.9.64.0/20 | AS4 | — |
| 128.9.80.0/20 | AS4 | — |
| 128.9.96.0/20 | AS4 | — |
| 165.140.12.0/24 | AS4 | — |
| 165.140.13.0/24 | AS4 | — |
| 165.140.14.0/24 | AS4 | — |
| 170.79.218.0/23 | AS4 | — |
| 198.32.16.0/24 | AS4 | — |
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Related lookups and next steps
Frequently asked questions about this ASN page
What does AS4 represent?
AS4 is an autonomous system number. The current source associates it with ISI-AS - University of Southern California and the region field an unknown region; those values add network context but do not prove a specific service, physical location, or quality level.
What are peers, upstreams, and prefixes useful for on the AS4 page?
They help explain the scale, interconnection depth, and route structure of AS4. Richer peering and upstream data often indicate broader network reach, but they should still be interpreted together with prefixes and related IP landing pages.
What should you do after reviewing AS4?
Open a concrete IP page to check how the address maps into AS4, then compare the prefix, source labels, and query time. Verify operator or service claims with the relevant registry or network operator.
Related topics
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