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IP Subnet Calculator
Calculate network addresses, host ranges, broadcast addresses, and subnet details from any IP address and CIDR prefix length.
Enter Subnet Details
Enter a number to auto-select the smallest subnet that fits
CIDR Notation Quick Reference
| CIDR | Subnet Mask | Total Addresses | Usable Hosts | Typical Use |
|---|---|---|---|---|
| /24 | 255.255.255.0 | 256 | 254 | Standard office LAN |
| /25 | 255.255.255.128 | 128 | 126 | Medium department |
| /26 | 255.255.255.192 | 64 | 62 | Small department / VLAN |
| /27 | 255.255.255.224 | 32 | 30 | Server farm, Wi-Fi segment |
| /28 | 255.255.255.240 | 16 | 14 | Small server group |
| /29 | 255.255.255.248 | 8 | 6 | Point-to-point links |
| /30 | 255.255.255.252 | 4 | 2 | Router-to-router link |
Usable hosts exclude the network address and broadcast address. For point-to-point links, /31 (2 addresses) is sometimes used per RFC 3021. Talk to our network team
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