Subnet Calculator.
Enter an IPv4 address and either a prefix (e.g. /24) or a subnet mask (e.g. 255.255.255.0). Click Calculate.
Quick examples: 10.0.0.5 /8, 172.16.5.4 255.255.252.0
Network
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Broadcast
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First host
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Last host
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Hosts per subnet
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Prefix
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Mask
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Wildcard
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Binary (IP / Mask)
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Notes
- /31 and /32 networks are handled specially: /31 has 0 usable hosts (RFC 3021) and /32 is a single-host route.
- This tool only supports IPv4.