IPv4 Calculator

IP and Subnet Mask or CIDR

Use IP & CIDR Subnet Mask:10.0.0.1/22
Or IP & Subnet Mask:10.0.0.1 255.255.252.0
Or IP & Wildcard Mask:10.0.0.1 0.0.3.255

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Some are born great, some achieve greatness, and some hire PR officers.

By: Daniel J. Boorstin.