Subnet Calculator
Subnet Mask
255.255.255.0
Network Address
192.168.1.0
Broadcast
192.168.1.255
First Host
192.168.1.1
Last Host
192.168.1.254
Usable Hosts
254
Total Hosts
256
Wildcard Mask
0.0.0.255
Binary Mask
11111111.11111111.11111111.00000000
About the Subnet Calculator
How to use it
1. Enter an IPv4 address and a CIDR prefix, e.g. 192.168.1.0/24. 2. Read off the network address, broadcast address, subnet mask, and usable host range. 3. Use the copy buttons to grab values for your router or firewall configuration.
What is CIDR?
CIDR notation (like /24) says how many bits of the address identify the network. /24 means the first 24 bits are the network and the remaining 8 bits (254 usable addresses) are for hosts.
What the calculator shows
Network address, broadcast address, subnet mask, wildcard mask, the usable host range, total vs usable host counts, and the address in binary — everything a network engineer needs when designing or troubleshooting a network.
Common example
192.168.1.0/24 is the classic home network: subnet mask 255.255.255.0, usable addresses 192.168.1.1 through 192.168.1.254, broadcast 192.168.1.255. Your home router is usually 192.168.1.1 or 192.168.10.1.