AS47

AS47 is a legacy allocation registered under ARIN to the University of Southern California (OrgId USC-6, Los Angeles, CA), and it carries USC's main campus network (USCnet) — distinct from the USC Information Sciences Institute. This completes the historically significant USC/ISI cluster: AS4 is USC/ISI, AS226 is Los Nettos (the USC/ISI-operated Los Angeles regional network), and AS47 is the USC main campus, which peers directly with Los Nettos. As of June 2026 it is actively announcing 17 IPv4 prefixes and no IPv6 (~67,072 addresses), with peers/upstreams AS226 and AS567 (both Los Nettos) and AS2153 (CENIC); announced blocks include 68.181.0.0/16, 206.117.90.0/24, and 207.151.x ranges. RPKI shows 0 valid and 0 invalid, but 68.181.0.0/16 and 68.181.82.0/24 are flagged IRR-invalid (origin/parent mismatch) — an IRR hygiene issue worth noting for route-filtering, not an RPKI problem. The ARIN ASN RegDate is 1985-08-16 (mirrors vary 08-15/16/17; autnum updated 2003-12-16). For triage this is a live, well-connected university ASN. No notable public abuse signal was found as of June 2026.

Operator

University of Southern California (ARIN OrgId USC-6, Los Angeles, CA 90089) [Confirmed] — ARIN RDAP

Country / RIR

US, ARIN [Confirmed]

Allocated

ARIN ASN RegDate 1985-08-16 (mirrors vary 08-15/16/17; autnum updated 2003-12-16; org updated 2024-11-25) [Confirmed]

Org status

active — usc.edu

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal found as of 2026-06-08; clean academic network — bgp.he.net

Network & routing

Network type

research / education [Confirmed]

Size

17 IPv4 prefixes, 0 IPv6 (~67,072 addrs); incl. 68.181.0.0/16, 206.117.90.0/24, 207.151.x — bgp.he.net (2026-06)

Routing/peering

actively announcing; peers/upstreams AS226 + AS567 (Los Nettos), AS2153 (CENIC); avg AS path length 5.389 — bgp.he.net

RPKI

0 valid, 0 invalid; 68.181.0.0/16 + 68.181.82.0/24 flagged IRR-invalid (origin/parent mismatch — IRR hygiene, not RPKI) [Confirmed] — bgp.he.net

Notable usage

USC main campus network (USCnet), distinct from USC/ISI. USC/ISI cluster: AS4=USC/ISI, AS226=Los Nettos, AS47=USC main — usc.edu

Related ASNs

AS4 (USC/ISI), AS226 + AS567 (Los Nettos) [Confirmed]

Analyst note

Live, well-connected university ASN; part of the historically significant USC/ISI/Los Nettos cluster. IRR-invalid flags on its largest block matter for route-filtering decisions.