Free tool

IPv4 subnet calculator

Enter an address with a prefix length or a mask. Results update as you type and nothing leaves your browser.

Address / prefix or mask Split into

Examples: 192.168.1.10/24, 172.16.5.1 255.255.252.0, 10.0.0.0/8

Subnets

#	Network	Usable range	Broadcast

Tracking hundreds of subnets across switches, routers and firewalls? NetManager's Networks tab lists every connected subnet and route in your fleet automatically.