133.51.0.0/16

IPv4 prefix announced by AS37917 University of Tsukuba

unknown RPKI

VALID announced

1 Recorded origin

Routing

Recorded origin: AS37917 University of Tsukuba unknown
Observed origin (RIS): AS37917 UTINS - University of Tsukuba
Country: Japan

RPKI: rpki.cloudflare.com · 2026-06-17 · Routing: RIPEstat · 2026-06-18