Developer Networking Utility
Subnet Calculator
Calculate IPv4 network, mask, broadcast, address count, and host range from an address and CIDR prefix.
Calculate IPv4 subnet
Method
The calculator converts IPv4 octets to an unsigned 32-bit value, applies the CIDR network mask, and derives the network, wildcard, broadcast, address count, and host range.
Worked example
192.168.1.10/24 produces network 192.168.1.0, mask 255.255.255.0, wildcard 0.0.0.255, broadcast 192.168.1.255, and 256 total addresses.
Privacy
The address is processed locally in the browser.
Limitations
This IPv4 calculator does not configure a network, test reachability, inspect routing, validate ACLs, or provide security advice. IPv6 is not included in this version.
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