IP Subnet Calculator

Calculate network address, broadcast address, usable IP range, and more with our comprehensive IP Subnet Calculator.

Enter a valid IPv4 address in dotted decimal format (e.g., 192.168.1.1)
You can also enter a custom subnet mask (e.g., 255.255.255.0) or CIDR notation (e.g., 24)
Display Options
Display the binary format of IP addresses and subnet masks
Display the first and last usable IP addresses in the subnet
Limited to subnets with 1000 or fewer addresses
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What is an IP Subnet Calculator?

An IP Subnet Calculator is a tool that helps network administrators and IT professionals analyze and plan IP networks. It calculates various network parameters based on an IP address and subnet mask, including network address, broadcast address, usable IP range, and the total number of hosts possible in the subnet.

Understanding IP Addressing and Subnetting

IP addressing is the foundation of network communication. IPv4 addresses consist of 32 bits, typically represented as four octets separated by dots (e.g., 192.168.1.1). Subnetting divides a larger network into smaller, more manageable segments, improving security, performance, and address utilization.

A subnet mask determines which portion of an IP address identifies the network and which portion identifies hosts. It can be represented in decimal format (e.g., 255.255.255.0) or CIDR notation (e.g., /24).

Key Subnet Calculations

  • Network Address: The first address in a subnet, identifying the network itself.
  • Broadcast Address: The last address in a subnet, used to send data to all hosts in the network.
  • Usable IP Range: The addresses between the network and broadcast addresses, available for host assignment.
  • Total Hosts: The maximum number of devices that can be connected to the subnet.
  • Usable Hosts: The number of addresses available for actual devices (total hosts minus network and broadcast addresses).

Benefits of Using an IP Subnet Calculator

Subnet calculations can be complex and error-prone when done manually. Our IP Subnet Calculator offers several advantages:

  • Accuracy: Eliminates human error in subnet calculations.
  • Efficiency: Provides instant results for network planning.
  • Comprehensive Information: Delivers all relevant subnet parameters in one place.
  • Educational Value: Helps users understand the relationship between IP addresses, subnet masks, and network parameters.

How to Use Our IP Subnet Calculator

Using our calculator is straightforward:

  1. Enter an IP address (e.g., 192.168.1.1)
  2. Enter a subnet mask in decimal (e.g., 255.255.255.0) or CIDR notation (e.g., 24)
  3. Optionally select to show binary representations and host range
  4. Get comprehensive subnet information instantly