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How to Calculate Subnet Information
Formula
Subnetting divides an IP network into smaller segments. The CIDR prefix length determines how many bits are used for the network portion, and the remaining bits determine the number of available host addresses.
For a /24 network, there are 8 host bits giving 256 total addresses (254 usable hosts after removing network and broadcast addresses).
Common use cases:
- Network design and IP address planning
- IT certification exam preparation
- Firewall and routing configuration
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