IPv4 CIDR Subnet Calculator
Calculate subnet masks, usable host ranges, broadcast addresses, and CIDR prefix block allocations for router network administration and IP subnet planning.
Subnet Mask
255.255.255.0
Network Address
192.168.1.0
Broadcast Address
192.168.1.255
Usable Host Range
192.168.1.1 - 192.168.1.254
Total Usable Hosts
254
Wildcard Mask
0.0.0.255
RFC 1918 Private IP Address Ranges
| Class | IP Range | Subnet Mask (CIDR) | Common Router Use |
|---|---|---|---|
| Class A | 10.0.0.0 – 10.255.255.255 |
255.0.0.0 (/8) |
Comcast Xfinity, Apple AirPort, enterprise networks |
| Class B | 172.16.0.0 – 172.31.255.255 |
255.240.0.0 (/12) |
Corporate LANs, internal VPN endpoints |
| Class C | 192.168.0.0 – 192.168.255.255 |
255.255.0.0 (/16 or /24) |
Home routers (192.168.1.1, 192.168.0.1, 192.168.2.1) |