Subnet Calculator

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IPv4 network, broadcast, mask & host range from CIDR.

IPv4 address & subnet

IP address

Subnet (CIDR)

Usable hosts

254

Network address: 192.168.1.0
Broadcast address: 192.168.1.255
Subnet mask: 255.255.255.0
Wildcard mask: 0.0.0.255
Host rangefirst – last usable: 192.168.1.1 – 192.168.1.254
Total addresses: 256

Subnet Calculator

Enter an IPv4 address and CIDR prefix to instantly get the network and broadcast addresses, subnet mask, wildcard mask, usable host range and host count - essential for network planning.

Frequently asked questions

What does the CIDR /24 mean?

The number after the slash is how many bits are the network portion. /24 means a 255.255.255.0 mask with 256 addresses (254 usable hosts).

Why are two addresses unusable?

The first address in a subnet is the network identifier and the last is the broadcast address, so usable hosts = total − 2 (for /31 and /32 the rules differ).

Keep going - these pair well with what you just calculated.