AS4 University of Southern California
AS4 (ISI-AS) is registered to University of Southern California in US, through ARIN. It originates 50 prefixes in the global routing table.
Who holds AS4
Names from RIPE NCC’s daily list of every allocated AS number. The ASN lookup fetches the full WHOIS record live.
WHOIS recordARIN
# # ARIN WHOIS data and services are subject to the Terms of Use # available at: https://www.arin.net/resources/registry/whois/tou/ # # If you see inaccuracies in the results, please report at # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/ # # Copyright 1997-2026, American Registry for Internet Numbers, Ltd. # ASNumber: 4 ASName: ISI-AS ASHandle: AS4 RegDate: 1984-02-22 Updated: 2023-09-29 Ref: https://rdap.arin.net/registry/autnum/4 OrgName: University of Southern California OrgId: USC-32-Z Address: Information Sciences Institute Address: 4676 Admiralty Way, Suite 1001 City: Marina del Rey StateProv: CA PostalCode: 90292 Country: US RegDate: 2023-09-08 Updated: 2023-09-21 Ref: https://rdap.arin.net/registry/entity/USC-32-Z OrgTechHandle: ACT-ORG-ARIN OrgTechName: IPC Computing Services OrgTechPhone: +1-310-448-8289 OrgTechEmail: action@isi.edu OrgTechRef: https://rdap.arin.net/registry/entity/ACT-ORG-ARIN OrgAbuseHandle: ACT-ORG-ARIN OrgAbuseName: IPC Computing Services OrgAbusePhone: +1-310-448-8289 OrgAbuseEmail: action@isi.edu OrgAbuseRef: https://rdap.arin.net/registry/entity/ACT-ORG-ARIN # # ARIN WHOIS data and services are subject to the Terms of Use # available at: https://www.arin.net/resources/registry/whois/tou/ # # If you see inaccuracies in the results, please report at # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/ # # Copyright 1997-2026, American Registry for Internet Numbers, Ltd. #
What AS4 announces
Prefixes originated by AS4 in the RouteViews table (refreshed every four hours), each checked against the RPKI (every ten minutes) and the IRR (daily).
Announced prefixes
Each opens its own page: who announces it, the paths our collectors see, its ROAs and route objects.
RPKI valid RPKI invalid no ROA covers it
Who AS4 is reached through
The AS just before AS4 in the paths our looking glass collectors hold, for 50 of its prefixes. Usually a transit provider, sometimes a peer. The number is how many of those prefixes it was seen on.
Routing registry objects
From the mirrored IRR databases (RADB, the five RIRs and more). Look it up live.
| Source | as-name | Maintained by |
|---|---|---|
| NTTCOM | ISI | MAINT-AS226 |
Route objects with origin AS4: NTTCOM 24 · LEVEL3 4 · APNIC 2 · ARIN 1 · RADB 1