IP Subnet Calculator
Enter an IP address and CIDR or subnet mask. Get network address, broadcast, usable host range, host count, and wildcard mask instantly.
Examples:
Quick reference: common subnets
| CIDR | Subnet Mask | Usable Hosts | Common Use |
|---|---|---|---|
/8 | 255.0.0.0 | 16,777,214 | Class A (10.x.x.x private) |
/16 | 255.255.0.0 | 65,534 | Class B (172.16–31.x.x private) |
/24 | 255.255.255.0 | 254 | Standard small network |
/25 | 255.255.255.128 | 126 | Split /24 in half |
/26 | 255.255.255.192 | 62 | Small department network |
/27 | 255.255.255.224 | 30 | Small team / VLAN |
/28 | 255.255.255.240 | 14 | Very small segment |
/29 | 255.255.255.248 | 6 | Point-to-point with hosts |
/30 | 255.255.255.252 | 2 | Point-to-point link |
/31 | 255.255.255.254 | 2 | Router-to-router (RFC 3021) |
/32 | 255.255.255.255 | 1 (host route) | Loopback / single host |