121.0.16.0/20
🇨🇳CIDR
121.0.16.0/20
IP Version
IPv4
Addresses
4K
Mask
/20 (255.255.240.0)
Country
🇨🇳 China
City
Hangzhou
RIR
APNIC
Status
allocated
Allocated
9/25/2006
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 121.0.16.0/20 | AS37963ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd. | Valid | APNIC | 6/13/2026 |
Covering Prefix
3 less-specific announcements| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 121.0.16.0/21 | AS37963ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd. | Valid | — | 6/13/2026 |
| 121.0.24.0/22 | AS37963ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd. | Valid | — | 6/13/2026 |
| 121.0.28.0/22 | AS37963ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd. | Valid | — | 6/13/2026 |
Geolocation
API
Open https://api.ipctl.io/v1/prefix/121.0.16.0/20Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/121.0.16.0/20" | jq
External Links