IP Subnet Calculator

What is IP Subnetting?

Subnetting is the process of dividing a large network into smaller, more manageable sub-networks (subnets). This helps with:

Network Organization: Group devices logically and efficiently
Security: Isolate different parts of your network
Performance: Reduce network congestion and broadcast traffic
IP Address Management: Make better use of available IP addresses

How to use this calculator: Enter an IP address and subnet mask (either in CIDR notation like /24 or dotted decimal like 255.255.255.0). The calculator will show you all the network details, including usable IP ranges, binary representations, and subnetting options.

Network Information

Network Address:

Broadcast Address:

First Usable IP:

Last Usable IP:

Total Hosts:

Usable Hosts:

Subnet Mask Details

CIDR Notation:

Dotted Decimal:

Hexadecimal:

Wildcard Mask:

IP Class:

Network Type:

Binary Representation

IP Address:

Subnet Mask:

Network Address:

VLSM Calculator

Subnet Division

Network Summary

Number of Subnets Needed:

Hosts per Subnet:

Variable Length Subnet Masking (VLSM)

VLSM allows you to use different subnet mask lengths within the same network, enabling more efficient use of IP addresses by allocating exactly the number of addresses needed for each subnet.

Number of Equal Subnets:

Equal Subnet Division

This divides your network into equally-sized subnets. Useful when you need multiple subnets with the same number of hosts in each.

Network Analysis Summary

Calculate a network first to see detailed analysis and recommendations.