IP & Subnet Calculator

New

Network, broadcast, mask and usable hosts from an address and prefix — and it names the prefix for a number of hosts

This tool runs entirely in your browser — no file or data is sent to any server.

Address and prefix

IPv4 address

Prefix

How many hosts do you need

Give a number and it names the prefix that fits

Hosts

The network

Network address

192.168.1.0/24

Usable hosts

254

256 addresses in all

Subnet mask: 255.255.255.0
Wildcard: 0.0.0.255
First host: 192.168.1.1
Last host: 192.168.1.254
Broadcast: 192.168.1.255
Range: Private

The total and the usable count are not the same — the first address is the network and the last is the broadcast, and neither can be given to a machine. So a /24 holds 256 addresses but only 254 are assignable. A /31 or /32 leaves none at all.

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