AS4 ISI-AS - University of Southern California
🇺🇸ARINassigned
Announced Prefixes (BGP)
53total
45 IPv48 IPv6
IPv4 Addresses
Allocated (RIR)65,536
Announced (BGP)70,400
IPv6 Addresses
Allocated (RIR)7.9×10²⁸
Announced (BGP)1.5×10²⁹
Announced Prefixes
(BGP)53|
Prefix | RPKI | IRR | Last Seen |
|---|---|---|---|
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 | |
| No ROA | - | 2026-10-11 |
1-10 of 53
1 / 6
Allocated Prefixes
(RIR)2Prefix | Country | RIR | Status |
|---|---|---|---|
| 128.9.0.0/16 | 🇺🇸 US | ARIN | allocated |
| 2606:d5c0::/32 | 🇺🇸 US | ARIN | allocated |
All 53 announced prefixes of AS4 →
BGP Neighbours
(seen in AS paths)Upstreams (8)
Networks AS4 hands its own prefixes to: transit providers, or peers at an exchange.
Other adjacent networks (1)
Adjacent to AS4 in the transit part of AS paths: peers, providers or customers.
- AS37358BITCO1
ASPA
No ASPA
External Links
Learn more
- What is an ASN?Autonomous systems, ASN ranges and how they are assigned
- RPKI and route origin validationWhat the RPKI badges on the prefix list mean
- ASPA explainedWhy AS4 should publish an ASPA object
- IPv4 transfers in the ARIN regionMonthly volume and the latest registry transfers
- ASN data in AI agents and SIEMMCP server and API integrations
API
Open https://api.ipctl.io/v1/asn/4Returns ASN details, announced prefixes, and BGP routing data.
curl -s "https://api.ipctl.io/v1/asn/4" | jq