IPv4 Subnet Calculator
Calculate network, broadcast, mask, and host range from CIDR.
Runs locally · Nothing uploaded
CIDR notation
Subnet details
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About IPv4 Subnet Calculator
Enter CIDR notation like 192.168.1.0/24 and get the network address, broadcast address, subnet mask, wildcard mask, first and last usable host, and total host count. Everything is computed locally with plain bit arithmetic — ideal for planning VPCs, VLANs, and firewall rules.
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