Tools

IPv4 Subnet Calculator

Enter an IP address and prefix (CIDR) or mask – network address, broadcast, host range and mask are calculated live.

Everything happens in your browser. Nothing is transmitted.

IPv4 address

Prefix (CIDR) or subnet mask

Examples: 10.0.0.5 + 8 · 172.16.40.7 + 255.255.240.0 · 192.168.1.10 + 31