Subnet Calculator (CIDR)

A free online IP Subnet & CIDR Calculator. Input any IPv4 address and CIDR prefix (e.g. 192.168.1.0/24) to instantly calculate the subnet mask, wildcard mask, network address, broadcast address, first usable IP, last usable IP, and total usable host count. Essential for network engineers, backend developers, and cloud administrators designing VPC subnets on AWS, Google Cloud, or Azure.

Standard Subnet Sizes Reference

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