Subnet Calculator

Instantly calculate subnet information essential for network design

Calculate network information from IP address and subnet mask length.

How to Use Subnet Calculator
1

Enter an IP address (e.g., 192.168.1.1)

2

Enter subnet mask length in CIDR notation (e.g., 24)

3

Click the 'Calculate' button

4

Review network information (network address, broadcast address, etc.)

5

Switch display format to view in binary, octal, or hexadecimal

6

Enter new values and recalculate for different IP addresses

Key Features
IPv4 address subnet calculation
Support for CIDR notation (/0 to /32)
Calculate network and broadcast addresses
Display host range (first and last host addresses)
Calculate number of available hosts
Switch between binary, octal, decimal, and hexadecimal display
Real-time input validation and error display
Responsive design for mobile devices
/32

Frequently Asked Questions

A subnet calculator is a tool that automatically calculates network information such as network address, broadcast address, host range, and number of available hosts from an IP address and subnet mask length (CIDR notation). It's useful for network design and management.
CIDR (Classless Inter-Domain Routing) notation is a method of representing IP addresses by adding a slash and number after the IP address to indicate the number of network bits. For example, /24 means the upper 24 bits are the network portion, equivalent to a subnet mask of 255.255.255.0.
The number of available hosts is calculated from the number of host bits. For example, with /24 (8 host bits), 2^8 - 2 = 254 hosts can be placed. We subtract 2 because the network address and broadcast address are excluded.
Binary display helps understand bit operations, hexadecimal is used in configuration files, and octal is used in specific systems. We provide multiple display formats to help with network device configuration and deeper understanding.
Yes. /31 is for point-to-point connections with 2 IP addresses, and /32 is for host specification with only 1 IP address. In these cases, the usual concepts of network and broadcast addresses don't apply.