Subnet calculator
- Network address
- 192.168.1.0/24
- Usable host range
- 192.168.1.1 - 192.168.1.254
- Broadcast address
- 192.168.1.255
- Subnet mask
- 255.255.255.0
- Wildcard mask
- 0.0.0.255
- Usable hosts
- 254 (of 256)
What is a subnet?
A subnet splits a network into smaller blocks of addresses. The
CIDR suffix (the /24 in
192.168.1.0/24) says how many bits are fixed for the network
- the rest are free for hosts.
Reading the numbers
- /24 → mask
255.255.255.0, 256 addresses, 254 usable hosts. - /25 → mask
255.255.255.128, 128 addresses, 126 usable hosts. - /30 → mask
255.255.255.252, 4 addresses, 2 usable hosts (handy for point-to-point links).
The first address in a block is the network address and the last is the broadcast address, which is why usable hosts are always two fewer than the total.