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IPv4 Subnet Mask Calculator
Enter an IPv4 address, mask, prefix, host count or subnet split and get the exact network, host range, wildcard mask and CIDR data instantly.
Network address + mask/prefix
Enter an IPv4 address, mask, prefix, host count or subnet split and get the exact network, host range, wildcard mask and CIDR data instantly.
Subnet details
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- Subnet mask
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- First usable host
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- Last usable host
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- Total IP addresses
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- Usable hosts
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- Block size / increment
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- Class & scope
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Generated subnets
| # | CIDR | Network | Host range | Broadcast |
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No subnets to display yet.
IPv4 subnetting tips
- CIDR prefixes are counted from the left: /24 equals 255.255.255.0 and provides 256 addresses.
- /31 subnets are perfect for point-to-point links, while /32 reserves a single host (loopbacks, VIPs).
- Plan ahead by checking if your subnet is within private ranges like 10/8, 172.16/12 or 192.168/16.