218.251.128.0/17
🇯🇵CIDR
218.251.128.0/17
IP Version
IPv4
Addresses
32.7K
Mask
/17 (255.255.128.0)
Country
🇯🇵 Japan
City
Chiyoda City (Kudanminami)
RIR
APNIC
Status
allocated
Allocated
1/27/2005
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 218.251.128.0/17 | AS23720RMNI-AS-AP - Rakuten Mobile Network, Inc. | No ROA | APNICRADB | 6/1/2026 |
Covering Prefix
1 less-specific announcement| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 218.251.220.0/24 | AS50605Radius Radius Communications Ltd | Valid | — | 6/1/2026 |
More Specific Prefixes
| Prefix | AS | Country | Status |
|---|---|---|---|
| 218.251.128.0/18 | 🇯🇵JP | assigned | |
| 218.251.224.0/20 | 🇯🇵JP | assigned | |
| 218.251.240.0/20 | 🇯🇵JP | assigned | |
| 218.251.220.0/22 | 🇯🇵JP | assigned |
Geolocation
API
Open https://api.ipctl.io/v1/prefix/218.251.128.0/17Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/218.251.128.0/17" | jq
External Links