🛠️ Interactive Utility
CIDR Subnet Cheat-Sheet & CSV Exporter
Complete reference table for IPv4 prefix lengths (/0 to /32) with total IPs, usable hosts, and wildcard masks with CSV download.
Standard IPv4 prefix lengths (/0 to /32)
Download Subnet Cheat Sheet (CSV) ↓
| CIDR Prefix | Subnet Mask | Total Addresses | Usable Hosts | Wildcard Mask |
|---|---|---|---|---|
| /24 | 255.255.255.0 | 256 | 254 | 0.0.0.255 |
| /25 | 255.255.255.128 | 128 | 126 | 0.0.0.127 |
| /26 | 255.255.255.192 | 64 | 62 | 0.0.0.63 |
| /27 | 255.255.255.224 | 32 | 30 | 0.0.0.31 |
| /28 | 255.255.255.240 | 16 | 14 | 0.0.0.15 |
| /29 | 255.255.255.248 | 8 | 6 | 0.0.0.7 |
| /30 | 255.255.255.252 | 4 | 2 | 0.0.0.3 |
| /31 | 255.255.255.254 | 2 | 2 (RFC 3021) | 0.0.0.1 |
| /32 | 255.255.255.255 | 1 | 1 (Single Host) | 0.0.0.0 |
| /16 | 255.255.0.0 | 65,536 | 65,534 | 0.0.255.255 |
| /8 | 255.0.0.0 | 16,777,216 | 16,777,214 | 0.255.255.255 |