IP Subnet Calculator

A tool for calculating and practicing IP subnetting using the "Magic Number" method.

IP Address

Subnet Mask (CIDR or Dotted Decimal)

Subnet Information

Subnet ID (Network):

Broadcast Address:

First Usable Host:

Last Usable Host:

Subnet Mask:

Wildcard Mask:

Total IP Addresses:

Usable Host Addresses:

Magic Number:

Magic Number Method Steps

Binary Representation

Select Difficulty:

Score: 0 / 0

Practice Problem

IP Address:

Subnet Mask:

Subnet ID (Network Address):

Broadcast Address:

First Usable Host:

Last Usable Host:

CIDR Reference Chart

CIDR	Subnet Mask	Wildcard Mask	Usable Hosts