172.0.0.0/12
🇺🇸CIDR
172.0.0.0/12
IP Version
IPv4
Addresses
1M
Mask
/12 (255.240.0.0)
Country
🇺🇸 United States
City
Calera
RIR
ARIN
Status
allocated
Allocated
8/20/2012
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 172.0.0.0/12 | AS7018ATT-INTERNET4 - AT&T Enterprises, LLC | Valid | ARIN | 6/1/2026 |
Covering Prefix
1 less-specific announcement| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 172.15.178.0/24 | AS18747IFX18747 - IFX Corporation | Invalid | — | 6/1/2026 |
Geolocation
API
Open https://api.ipctl.io/v1/prefix/172.0.0.0/12Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/172.0.0.0/12" | jq
External Links