IPv4 Address & Subnet

Subnet details

Enter an IPv4 address and CIDR prefix length. Network and broadcast addresses follow standard classless rules.

IPv4 address

CIDR prefix

Network address—

Broadcast address—

Subnet mask—

Wildcard mask—

First usable host—

Last usable host—

Usable hosts—

Address (binary)—

For /31 and /32 networks, usable host rules vary by use case; this tool shows the arithmetic host range excluding network and broadcast where applicable.