216.21.19.0/24
IPv4 prefix announced by AS5721 National Defense University
unknown RPKI
VALID announced
1 Recorded origin
Routing
- Recorded origin
- AS5721 National Defense University unknown
- Observed origin (RIS)
- AS5721 NDU-NET - National Defense University
- Country
- United States
RPKI: rpki.cloudflare.com · 2026-06-17 · Routing: RIPEstat · 2026-06-19