121.251.36.0/23
🇨🇳IPv4APNICannouncedMOASNo ROA
CIDR
121.251.36.0/23
IP Version
IPv4
Addresses
512
Mask
/23 (255.255.254.0)
Country
🇨🇳 China
City
Nanjing
RIR
APNIC
Status
announced
Allocated
-
Announced BGP Routes
2 of 2 routesMOAS - 2 origin ASNs
RPKI:
IRR:
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 121.251.36.0/23 | AS4538ERX-CERNET-BKB - China Education and Research Network Center | No ROA | — | 6/1/2026 |
| 121.251.36.0/23 | AS24362CNGI-HEF-IX-AS-AP - CERNET2 IX at University of Science and Technology of China | No ROA | — | 6/1/2026 |
Covering Prefix
2 less-specific announcements| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 121.248.0.0/14 | AS4538ERX-CERNET-BKB - China Education and Research Network Center | No ROA | — | 6/1/2026 |
| 121.250.0.0/15 | AS4538ERX-CERNET-BKB - China Education and Research Network Center | No ROA | — | 6/1/2026 |
Origin ASNs (2)
AS4538MOAS
ERX-CERNET-BKB - China Education and Research Network Center
AS24362MOAS
CNGI-HEF-IX-AS-AP - CERNET2 IX at University of Science and Technology of China
Geolocation
API
Open https://api.ipctl.io/v1/prefix/121.251.36.0/23Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/121.251.36.0/23" | jq
External Links