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Subnet mask
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Network address
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Broadcast address
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Usable host range
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Usable hosts
Frequently Asked Questions
What does a subnet calculator tell me?
From an IP address and CIDR prefix it works out the subnet mask, the network and broadcast addresses, the range of usable host addresses, and how many hosts the subnet can hold.
Calculate the subnet mask, network and broadcast address, host range and usable hosts for any IPv4 address and CIDR prefix.