Free online tool
Enter an IPv4 address and prefix
Example: 192.168.1.10 with prefix /24. Calculations run locally in your browser; your input is not sent to a server.
Calculation results
Network details
Usable hosts
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Total addresses
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Prefix / CIDR
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Understand the subnet
Binary representation
The first prefix bits identify the network portion; the remaining bits identify host addresses.
Quick guide
What do these values mean?
Network address: identifies the subnet itself. Broadcast address: the IPv4 broadcast destination for the subnet.
Usable host range: the ordinary host addresses between the network and broadcast addresses. Wildcard mask: the inverse of the subnet mask, commonly used in Cisco ACLs and routing configurations.
Note: /31 networks are commonly used for point-to-point links, and /32 represents a single address. Their usable-address handling differs from a typical subnet.