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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
Frequently Asked Questions
Dr. David Park
Applied Mathematician, PhD Mathematics
David holds a PhD in Applied Mathematics from MIT. He has published research on numerical methods and computational algorithms used in engineering and scientific calculators.
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