Subnet calculator — mask and broadcast

Enter an IP address and a mask (e.g. /24 or 255.255.255.0) to get the network, broadcast and host range.

IP addressIP examples:

Mask or CIDRMask examples:

Network address192.168.1.0/24

Broadcast address192.168.1.255

Usable host range192.168.1.1 — 192.168.1.254

Mask255.255.255.0

Wildcard (for ACLs)0.0.0.255

Usable addresses254

Mask in binary11111111.11111111.11111111.00000000

Private address (RFC1918)RFC1918

Tip: /24 = 254 hosts, /25 = 126, /26 = 62. Every extra mask bit halves the network.