Subnet Calculator
Subnet Calculator
Calculate IPv4 ranges, masks, broadcasts, and usable hosts.
Pure math — no network access required.
IPv4 address and prefix
CIDR notation
192.168.1.42/24
10.0.0.1/8
172.16.12.5/20
Address range
Network
192.168.1.0
First usable
192.168.1.1
Last usable
192.168.1.254
Broadcast
192.168.1.255
Masks & capacity
Subnet mask
255.255.255.0
Wildcard mask
0.0.0.255
Total addresses
256
Usable hosts
254
Classification
Class C · Private
Binary
IP address
11000000.10101000.00000001.00101010
Network
11000000.10101000.00000001.00000000
Netmask
11111111.11111111.11111111.00000000