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How to Right-Size Azure Virtual Machines for Cost Savings
19 Aug, 2025
Free Tool
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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