HomePrefix Lookup121.100.56.0/21

121.100.56.0/21

🇯🇵
IPv4APNICallocatedAS56033No ROA
CIDR
121.100.56.0/21
IP Version
IPv4
Addresses
2K
Mask
/21 (255.255.248.0)
Country
🇯🇵 Japan
City
Minato-ku
RIR
APNIC
Status
allocated
Allocated
1/10/2011

Announced BGP Routes

0 of 0 routes
RPKI:
IRR:
PrefixOrigin ASRPKIIRRLast Seen
This prefix is not currently announced in BGP. See covering prefix below.

Covering Prefix

2 less-specific announcements
PrefixOrigin ASRPKIIRRLast Seen
121.100.56.0/22AS18097DCN - D.C.N. CorporationNo ROA—5/31/2026
121.100.60.0/22AS18097DCN - D.C.N. CorporationNo ROA—5/31/2026

More Specific Prefixes

100
PrefixASCountryStatus
121.100.58.4/32🇯🇵JPassigned
121.100.58.16/32🇯🇵JPassigned
121.100.58.26/32🇯🇵JPassigned
121.100.58.27/32🇯🇵JPassigned
121.100.58.29/32🇯🇵JPassigned
121.100.58.32/32🇯🇵JPassigned
121.100.58.34/32🇯🇵JPassigned
121.100.58.35/32🇯🇵JPassigned
121.100.58.36/32🇯🇵JPassigned
121.100.58.40/32🇯🇵JPassigned
121.100.58.45/32🇯🇵JPassigned
121.100.58.48/32🇯🇵JPassigned
121.100.58.57/32🇯🇵JPassigned
121.100.58.61/32🇯🇵JPassigned
121.100.58.63/32🇯🇵JPassigned
121.100.58.70/32🇯🇵JPassigned
121.100.58.76/32🇯🇵JPassigned
121.100.58.80/32🇯🇵JPassigned
121.100.58.89/32🇯🇵JPassigned
121.100.58.90/32🇯🇵JPassigned
121.100.58.100/32🇯🇵JPassigned
121.100.58.102/32🇯🇵JPassigned
121.100.58.107/32🇯🇵JPassigned
121.100.58.110/32🇯🇵JPassigned
121.100.58.121/32🇯🇵JPassigned
121.100.58.122/32🇯🇵JPassigned
121.100.58.123/32🇯🇵JPassigned
121.100.58.126/32🇯🇵JPassigned
121.100.58.127/32🇯🇵JPassigned
121.100.58.132/32🇯🇵JPassigned
121.100.58.135/32🇯🇵JPassigned
121.100.58.140/32🇯🇵JPassigned
121.100.58.141/32🇯🇵JPassigned
121.100.58.143/32🇯🇵JPassigned
121.100.58.147/32🇯🇵JPassigned
121.100.58.149/32🇯🇵JPassigned
121.100.58.150/32🇯🇵JPassigned
121.100.58.153/32🇯🇵JPassigned
121.100.58.155/32🇯🇵JPassigned
121.100.58.157/32🇯🇵JPassigned
121.100.58.160/32🇯🇵JPassigned
121.100.58.168/32🇯🇵JPassigned
121.100.58.169/32🇯🇵JPassigned
121.100.58.171/32🇯🇵JPassigned
121.100.58.174/32🇯🇵JPassigned
121.100.58.176/32🇯🇵JPassigned
121.100.58.177/32🇯🇵JPassigned
121.100.58.179/32🇯🇵JPassigned
121.100.58.183/32🇯🇵JPassigned
121.100.58.187/32🇯🇵JPassigned
121.100.58.188/32🇯🇵JPassigned
121.100.58.189/32🇯🇵JPassigned
121.100.58.200/32🇯🇵JPassigned
121.100.58.203/32🇯🇵JPassigned
121.100.58.204/32🇯🇵JPassigned
121.100.58.207/32🇯🇵JPassigned
121.100.58.211/32🇯🇵JPassigned
121.100.58.213/32🇯🇵JPassigned
121.100.58.216/32🇯🇵JPassigned
121.100.58.217/32🇯🇵JPassigned
121.100.58.219/32🇯🇵JPassigned
121.100.58.220/32🇯🇵JPassigned
121.100.58.221/32🇯🇵JPassigned
121.100.58.226/32🇯🇵JPassigned
121.100.58.232/32🇯🇵JPassigned
121.100.58.235/32🇯🇵JPassigned
121.100.58.236/32🇯🇵JPassigned
121.100.58.237/32🇯🇵JPassigned
121.100.58.246/32🇯🇵JPassigned
121.100.58.250/32🇯🇵JPassigned
121.100.58.251/32🇯🇵JPassigned
121.100.58.254/32🇯🇵JPassigned
121.100.58.255/32🇯🇵JPassigned
121.100.59.0/32🇯🇵JPassigned
121.100.59.5/32🇯🇵JPassigned
121.100.59.7/32🇯🇵JPassigned
121.100.59.10/32🇯🇵JPassigned
121.100.59.13/32🇯🇵JPassigned
121.100.59.14/32🇯🇵JPassigned
121.100.59.24/32🇯🇵JPassigned
121.100.59.25/32🇯🇵JPassigned
121.100.59.26/32🇯🇵JPassigned
121.100.59.27/32🇯🇵JPassigned
121.100.59.29/32🇯🇵JPassigned
121.100.59.32/32🇯🇵JPassigned
121.100.59.35/32🇯🇵JPassigned
121.100.59.43/32🇯🇵JPassigned
121.100.59.46/32🇯🇵JPassigned
121.100.59.53/32🇯🇵JPassigned
121.100.59.54/32🇯🇵JPassigned
121.100.59.55/32🇯🇵JPassigned
121.100.59.60/32🇯🇵JPassigned
121.100.59.62/32🇯🇵JPassigned
121.100.59.65/32🇯🇵JPassigned
121.100.59.70/32🇯🇵JPassigned
121.100.59.73/32🇯🇵JPassigned
121.100.59.77/32🇯🇵JPassigned
121.100.59.81/32🇯🇵JPassigned
121.100.59.83/32🇯🇵JPassigned
121.100.62.213/32🇯🇵JPassigned
Origin ASN
AS56033
Geolocation
Country🇯🇵JapanJP
RegionTokyo
CityMinato-ku
Coordinates35.6638, 139.7330 ↗
API
Open
GEThttps://api.ipctl.io/v1/prefix/121.100.56.0/21

Returns prefix allocation, BGP routes, and more-specific subnets.

curl -s "https://api.ipctl.io/v1/prefix/121.100.56.0/21" | jq
External Links
RIPEstat Hurricane Electric BGP