The original fully featured, professional IPv4 network calculators including classful subnet, CIDR and wildcard mask calculators

For classful subnets, use the IP Subnet Calculator. For a simple smart-phone optimized CIDR Calculator, visit CIDR Calc. For ACL (Access Control List) wildcard mask calculations, use the …

Calculate subnet details using IP address, subnet mask, and other parameters with this online IP Subnet Calculator.

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Online tool for calculating IP subnets, including CIDR network calculations and wildcard mask usage.

Subnet Calculator

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