📍 IP Subnet Calculator
Calculate CIDR notation, subnet masks, network/broadcast addresses, and usable IP ranges. Free, no ads, no signup.
Examples: 192.168.1.0/24 · 10.0.0.0/8 · 172.16.0.0/12 · 255.255.255.192
📖 CIDR Reference Table
| CIDR | Mask | Hosts | CIDR | Mask | Hosts |
|---|---|---|---|---|---|
| /8 | 255.0.0.0 | 16,777,214 | /24 | 255.255.255.0 | 254 |
| /16 | 255.255.0.0 | 65,534 | /28 | 255.255.255.240 | 14 |
| /20 | 255.255.240.0 | 4,094 | /32 | 255.255.255.255 | 1 (host) |
🔗 Related Tools
🔧 For domain owners
📊 Professional Email Health Report
Get a detailed PDF audit with step-by-step fixes for your domain's email setup. Includes MX, SPF, DKIM, DMARC scores and recommendations.
Get Fix Report — €9 →