IP Subnet Calculator
Subnet mask and CIDR.
Result
Subnet mask
255.255.255.0
- Usable hosts
- 254
Common questions
How do I calculate subnets from a CIDR notation?
The CIDR prefix (e.g., /24) tells you how many bits are the network portion. A /24 has 256 addresses (254 usable). The calculator shows network address, broadcast address, and usable host range.
What is the difference between /24 and /16 subnets?
A /24 subnet has 256 addresses (one Class C). A /16 has 65,536 addresses. Each bit less in the prefix doubles the number of available addresses.