Subnet & CIDR Calculator

Enter an IPv4 address and CIDR prefix to instantly calculate the network, broadcast address, usable host range, subnet mask and more.

IPv4 address

CIDR prefix

network address

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broadcast address

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subnet mask

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usable host range

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usable hosts

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total addresses

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wildcard mask

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cidr notation

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ip class

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Subnet mask in binary

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network bits host bits

How it works

Enter an IP address and CIDR prefix above. The calculator will determine which portion of the address identifies the network and which portion is available for hosts.