Subnet Calculator
Calculate subnet masks, network addresses, broadcast addresses, and usable IP ranges. Free online IPv4 subnet calculator.
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📖 CIDR Reference
CIDR = Classless Inter-Domain Routing
Format: IP_ADDRESS/PREFIX
Example: 192.168.1.0/24
| /8 | 255.0.0.0 | 16,777,214 hosts |
| /16 | 255.255.0.0 | 65,534 hosts |
| /24 | 255.255.255.0 | 254 hosts |
| /25 | 255.255.255.128 | 126 hosts |
| /26 | 255.255.255.192 | 62 hosts |
| /27 | 255.255.255.224 | 30 hosts |
| /28 | 255.255.255.240 | 14 hosts |
| /29 | 255.255.255.248 | 6 hosts |
| /30 | 255.255.255.252 | 2 hosts |
| /32 | 255.255.255.255 | 1 host |
🔒 Private IP Ranges (RFC 1918)
- Class A: 10.0.0.0/8
- Class B: 172.16.0.0/12
- Class C: 192.168.0.0/16
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