1. What Is a Subnet Calculator?

A subnet calculator helps network administrators divide a network into smaller subnetworks (subnets). This calculator focuses on Class C networks (255.255.255.0) and helps determine the optimal subnet mask based on the number of hosts needed.

2. How Subnet Calculation Works

The calculator uses the following formula:

Where:

• 256 — Total number of possible host addresses in a Class C network
• Hosts — Number of host addresses needed per subnet

Explanation: The calculator finds the smallest subnet that can accommodate your specified number of hosts while accounting for network and broadcast addresses.

3. Importance of Subnetting

Details: Subnetting improves network security, reduces broadcast traffic, and allows for more efficient use of IP address space.

4. Using the Calculator

Tips: Enter the number of hosts you need to accommodate in each subnet. The calculator will determine the appropriate subnet mask and other relevant information.

5. Frequently Asked Questions (FAQ)

Q1: Why do we subtract 2 from the subnet size?
A: Each subnet requires one address for the network identifier and one for the broadcast address, leaving the rest for hosts.

Q2: What's the maximum number of hosts in a Class C subnet?
A: 254 hosts (256 total addresses minus network and broadcast addresses).

Q3: What does the subnet mask 255.255.255.0 mean?
A: It's the default Class C mask, allowing 254 hosts in one network.

Q4: When would I need to use subnetting?
A: When you need to divide your network into smaller segments for security, organization, or to reduce broadcast traffic.

Q5: Can I use this for networks other than Class C?
A: This calculator is specifically designed for Class C networks (255.255.255.0). Other network classes require different calculations.