CIDR・サブネット計算機
CIDR (Classless Inter-Domain Routing) writes an IP address and its network size together, like 192.168.1.10/24. Enter one to see the network and broadcast addresses, subnet mask, and the first and last usable host — useful for subnetting, firewall rules and VPC planning.
ツールの結果は英語で生成されます。