🧮 IP Subnet Calculator

Calculate subnet details including network, broadcast, and host range.

ℹ️ About IP Subnet Calculator

This IP Subnet Calculator is a professional networking tool designed to help you quickly determine network details from an IP address and subnet mask. It supports both standard dotted-decimal subnet masks and CIDR (Classless Inter-Domain Routing) notation.

Key features of the Subnet Calculator:

  • Network Address: Identifies the first address in the subnet.
  • Broadcast Address: Identifies the last address in the subnet used for broadcasting.
  • Usable Host Range: Shows the range of IP addresses that can be assigned to devices.
  • Total Hosts: Calculates the number of possible IP addresses in the subnet.

Whether you're a student learning Cisco CCNA concepts or a network engineer planning a VLAN, this tool provides accurate results instantly.

📖 How to use IP Subnet Calculator

  1. 1. Enter the IP address of the network or a host within the network (e.g., 192.168.1.1).
  2. 2. Enter the Subnet Mask in CIDR format (e.g., 24) or dotted-decimal format (e.g., 255.255.255.0).
  3. 3. Click the 'Run Tool' button to calculate the network details.
  4. 4. Review the results including Network Address, Broadcast Address, and Usable Host Range.

❓ Frequently Asked Questions

What is CIDR notation?

CIDR (Classless Inter-Domain Routing) notation is a compact way to represent an IP address and its associated routing prefix. It's written as the IP address followed by a slash and the number of leading bits of the mask (e.g., /24).

Why is the number of usable hosts 'Total Hosts - 2'?

In most subnets, two addresses are reserved: the Network Address (the first address) and the Broadcast Address (the last address). These cannot be assigned to individual devices, hence they are subtracted from the total.

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