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IP Subnet Calculator

Calculate network details for any IPv4 address and CIDR prefix — network address, broadcast, usable host range, wildcard mask — then split the network into smaller subnets. Everything runs in your browser; nothing is sent anywhere.

Input
Enter an IPv4 address and a /prefix or dotted subnet mask
Result
Network
192.168.1.0/24
Broadcast
192.168.1.255
Subnet mask
255.255.255.0
Wildcard mask
0.0.0.255
First usable
192.168.1.1
Last usable
192.168.1.254
Usable hosts
254
Total addresses
256
Class / type
C · private
Binary mask
11111111.11111111.11111111.00000000
Split into subnets
Divide 192.168.1.0/24 into smaller networks
#NetworkFirst hostLast hostBroadcast
1192.168.1.0/25192.168.1.1192.168.1.126192.168.1.127
2192.168.1.128/25192.168.1.129192.168.1.254192.168.1.255

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