Free Subnet Calculator

IPv4 CIDR network, broadcast, mask and host range.

Runs locallyNo uploadPrivate

IPv4 address

Prefix (CIDR)

Network address	192.168.1.0/24
Subnet mask	255.255.255.0
Wildcard mask	0.0.0.255
Broadcast address	192.168.1.255
First usable host	192.168.1.1
Last usable host	192.168.1.254
Total addresses	256
Usable hosts	254
IP class	C
Type	Private

Enter any IPv4 address and prefix length to get the network and broadcast addresses, subnet mask, host range, and host count. Everything is computed in your browser.

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About the Subnet Calculator

Free IPv4 subnet calculator. Enter an IP address and CIDR prefix to get the network and broadcast address, subnet mask, wildcard mask, usable host range and host count — all in your browser.

How it works

1
Enter an IP
Any IPv4 address, e.g. 192.168.1.10.
2
Pick a prefix
Choose the CIDR length (/0 to /32).
3
Read the results
Network, broadcast, mask and host range.

Frequently asked questions

The /number after an IP (like /24) that says how many leading bits are the network portion. /24 means the first 24 bits are the network and the last 8 identify hosts.

The network address and the broadcast address are reserved, so a /24 has 256 total addresses but 254 usable for hosts. (/31 and /32 are special cases.)