Tools/Web/IPv4 Subnet Calculator
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IPv4 Subnet Calculator

Calculate network and broadcast addresses, subnet masks, and host ranges from an IPv4 address and CIDR prefix.

IPv4 Subnet Calculator
Output
Waiting for input

Input and result notes

The CIDR prefix determines network boundaries, not just the address's last octet. Subnet calculations do not probe hosts; usable addresses depend on the network context.

Web
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