IP Subnet Calculator
Everything about a subnet at a glance — mask, wildcard, hosts, range, binary — plus splitting and a cheat sheet.
Loading Tool...
Help shape IP Subnet Calculator
The bug you just noticed will fade in 3 minutes. The feature idea will vanish after your next tab switch. Crazy peps don't suffer silently.
0/1000
Frequently Asked Questions
Apply the subnet mask to the IP (bitwise AND). Enter the IP and mask above and the network address is shown instantly.
Nothing — they're two notations for the same mask. /24 means the first 24 bits are the network.
Choose /24 under Split into subnets to get all 256 subnets, with CSV export.
10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 are reserved for internal networks and never routed on the internet.