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