Documentation

Getting Started

Welcome to NetConfig, the world's first all-in-one subnet calculator! This documentation will guide you through all features and capabilities of our tool.

System Requirements

• Modern web browser (Chrome, Firefox, Safari, Edge)
• JavaScript enabled
• Internet connection (for loading the tool)

Quick Start

To get started with NetConfig:

1. Open the calculator in your web browser
2. Enter an IP address in the "IP Address" field
3. Enter a subnet mask or use the CIDR slider
4. Click "Calculate" to see results

Basic Usage

The NetConfig calculator is designed to be intuitive and easy to use. Here's how to perform basic subnet calculations:

Simple Network Calculation

1. Enter an IP address (e.g., 192.168.1.1)
2. Enter a subnet mask (e.g., 255.255.255.0) or use the CIDR slider
3. The calculator will automatically display network information

Using the CIDR Slider

The CIDR slider provides a visual way to select subnet sizes:

• Drag the slider to change the CIDR value
• The subnet mask updates automatically
• Results update in real-time as you adjust the slider

Input Fields Explained

NetConfig provides several input fields to accommodate different subnetting scenarios:

IP Address

Enter any valid IPv4 address in dotted-decimal format (e.g., 192.168.1.1). This serves as the reference point for calculations.

Subnet Mask

Enter a subnet mask in dotted-decimal format (e.g., 255.255.255.0). This field automatically updates when you use the CIDR slider.

CIDR Slider

A visual slider to select the CIDR notation (0-32). Moving this slider automatically updates the subnet mask field and recalculates results.

Quantity

Specify the number of subnets you want to create when performing equal-sized subnetting (1-1024).

Hosts per Subnet

Enter the number of hosts needed per subnet. This field supports:

• Single value for fixed-length subnetting (e.g., 50)
• Comma-separated values for VLSM (e.g., 100,50,25)

Supernetting Input

Enter multiple networks (one per line) in CIDR notation for route summarization calculations.

Understanding Results

NetConfig provides comprehensive results for all subnetting calculations. Here's what each result means:

Network

The base network address in CIDR notation (e.g., 192.168.1.0/24). This is the starting address of the subnet.

Start IP

The first usable IP address in the subnet (typically network address + 1).

End IP

The last usable IP address in the subnet (typically broadcast address - 1).

Broadcast

The broadcast address for the subnet (all host bits set to 1). Note: /31 networks don't have a broadcast address.

Hosts

The number of usable host IP addresses in the subnet.

Netmask

The subnet mask in dotted-decimal format (e.g., 255.255.255.0).

Wildcard

The wildcard mask (inverse of subnet mask), used in ACLs and routing protocols.

Advanced Features

NetConfig includes powerful advanced features for complex networking scenarios:

When to Use Advanced Features

• Equal-Sized Subnetting: When you need to divide a network into subnets of equal size
• Fixed-Length: When each subnet requires the same number of hosts
• VLSM: When different subnets need different numbers of hosts (most efficient IP usage)
• Supernetting: When you want to summarize multiple routes in routing tables

VLSM Subnetting

Variable Length Subnet Masking (VLSM) allows you to create subnets of different sizes within the same network, maximizing IP address utilization.

How to Use VLSM

1. Enter the base network IP address and subnet mask
2. In the "Hosts per Subnet" field, enter comma-separated values representing the number of hosts needed for each subnet
3. Click "Calculate" to see the VLSM results

VLSM Best Practices

• Sort requirements from largest to smallest for optimal allocation
• Leave room for future growth when planning subnets
• Document your VLSM scheme for network management
• Consider using hierarchical addressing for easier management

Supernetting

Supernetting (or route summarization) combines multiple contiguous networks into a single summary route, reducing routing table size.

How to Use Supernetting

1. In the "Supernetting" textarea, enter the networks you want to summarize (one per line in CIDR format)
2. Click "Calculate" to see the summary route and individual networks

Supernetting Requirements

• Networks must be contiguous (no gaps between them)
• Networks must align on power-of-two boundaries
• The number of networks must be a power of two (2, 4, 8, 16, etc.)

Practical Examples

Here are some real-world examples of how to use NetConfig for common networking scenarios:

Example 1: Small Office Network

Scenario: You have the network 192.168.1.0/24 and need to create subnets for:

• 50 hosts for workstations
• 25 hosts for servers
• 10 hosts for guest WiFi

Solution using VLSM:

1. Enter IP: 192.168.1.1, Subnet Mask: 255.255.255.0
2. In "Hosts per Subnet" field: 50,25,10
3. Click "Calculate"
4. Result: Three subnets with sizes /26, /27, and /28

Example 2: Enterprise Network

Scenario: You need to divide 10.0.0.0/8 into 1000 equal-sized subnets.

Solution:

1. Enter IP: 10.0.0.1, Subnet Mask: 255.0.0.0
2. Set Quantity to 1000
3. Click "Calculate"
4. Result: 1000 subnets of size /22 (1022 hosts each)

Example 3: Route Summarization

Scenario: You have multiple branch office networks and want to summarize them for the core router.

Solution:

1. In Supernetting field, enter all branch networks (one per line)
2. Click "Calculate"
3. Use the summary route in your core router configuration