IP Address Subnet Calculator

An advanced IP address subnet calculator designed for network professionals. Calculate subnets, CIDR blocks, and more with accuracy and speed.

Full original guide (expanded)

IP Address Subnet Calculator

Compute IPv4 subnet masks, network ranges, and host counts for planning address space.

Subnet Calculator

Results

Network Address: -
Broadcast Address: -
Number of Hosts: -
Usable Hosts Range: -

Data Source and Methodology

All calculations are based on standard subnetting practices as outlined in authoritative networking literature. Please refer to the IETF RFC 4632 for detailed specifications on IP addressing and subnetting. All calculations are strictly based on the formulas and data provided by this source.

The Formula Explained

The subnet calculator uses the following formulas to determine network parameters:

Network Address: \( \text{IP} \& \text{Subnet Mask} \)

Broadcast Address: \( \text{Network Address} \mid \sim \text{Subnet Mask} \)

Number of Hosts: \( 2^{(32 - \text{Prefix Length})} - 2 \)

Glossary of Variables

  • IP Address: The unique number that identifies devices on a network.
  • Subnet Mask: A 32-bit number that divides the IP address into network and host portions.
  • Network Address: The first address in a subnet.
  • Broadcast Address: The last address in a subnet used to send data to all devices.
  • Number of Hosts: The total number of usable addresses in a subnet.

How It Works: A Step-by-Step Example

Let's assume an IP address of 192.168.1.1 with a subnet mask of 255.255.255.0. The calculator processes these as follows:

  1. Convert IP address and subnet mask to binary.
  2. Perform bitwise AND operation to find the Network Address.
  3. Perform bitwise OR operation with the inverted subnet mask to find the Broadcast Address.
  4. Calculate the number of hosts using the formula \( 2^{(32 - \text{Prefix Length})} - 2 \).

Frequently Asked Questions (FAQ)

What is a subnet mask?

A subnet mask is a 32-bit number that divides an IP address into network and host portions.

How do I calculate the number of hosts in a subnet?

The number of hosts is calculated as \( 2^{(32 - \text{Prefix Length})} - 2 \).

What is the network address?

The network address is the first address in a subnet that identifies the network itself.

What is the broadcast address?

The broadcast address is the last address in a subnet used to send data to all devices within the subnet.

Can this calculator handle IPv6?

This calculator is designed for IPv4. For IPv6, different tools are required due to its different structure and addressing scheme.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
Network Address: \( \text{IP} \& \text{Subnet Mask} \) Broadcast Address: \( \text{Network Address} \mid \sim \text{Subnet Mask} \) Number of Hosts: \( 2^{(32 - \text{Prefix Length})} - 2 \)
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

IP Address Subnet Calculator

Compute IPv4 subnet masks, network ranges, and host counts for planning address space.

Subnet Calculator

Results

Network Address: -
Broadcast Address: -
Number of Hosts: -
Usable Hosts Range: -

Data Source and Methodology

All calculations are based on standard subnetting practices as outlined in authoritative networking literature. Please refer to the IETF RFC 4632 for detailed specifications on IP addressing and subnetting. All calculations are strictly based on the formulas and data provided by this source.

The Formula Explained

The subnet calculator uses the following formulas to determine network parameters:

Network Address: \( \text{IP} \& \text{Subnet Mask} \)

Broadcast Address: \( \text{Network Address} \mid \sim \text{Subnet Mask} \)

Number of Hosts: \( 2^{(32 - \text{Prefix Length})} - 2 \)

Glossary of Variables

  • IP Address: The unique number that identifies devices on a network.
  • Subnet Mask: A 32-bit number that divides the IP address into network and host portions.
  • Network Address: The first address in a subnet.
  • Broadcast Address: The last address in a subnet used to send data to all devices.
  • Number of Hosts: The total number of usable addresses in a subnet.

How It Works: A Step-by-Step Example

Let's assume an IP address of 192.168.1.1 with a subnet mask of 255.255.255.0. The calculator processes these as follows:

  1. Convert IP address and subnet mask to binary.
  2. Perform bitwise AND operation to find the Network Address.
  3. Perform bitwise OR operation with the inverted subnet mask to find the Broadcast Address.
  4. Calculate the number of hosts using the formula \( 2^{(32 - \text{Prefix Length})} - 2 \).

Frequently Asked Questions (FAQ)

What is a subnet mask?

A subnet mask is a 32-bit number that divides an IP address into network and host portions.

How do I calculate the number of hosts in a subnet?

The number of hosts is calculated as \( 2^{(32 - \text{Prefix Length})} - 2 \).

What is the network address?

The network address is the first address in a subnet that identifies the network itself.

What is the broadcast address?

The broadcast address is the last address in a subnet used to send data to all devices within the subnet.

Can this calculator handle IPv6?

This calculator is designed for IPv4. For IPv6, different tools are required due to its different structure and addressing scheme.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
Network Address: \( \text{IP} \& \text{Subnet Mask} \) Broadcast Address: \( \text{Network Address} \mid \sim \text{Subnet Mask} \) Number of Hosts: \( 2^{(32 - \text{Prefix Length})} - 2 \)
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

IP Address Subnet Calculator

Compute IPv4 subnet masks, network ranges, and host counts for planning address space.

Subnet Calculator

Results

Network Address: -
Broadcast Address: -
Number of Hosts: -
Usable Hosts Range: -

Data Source and Methodology

All calculations are based on standard subnetting practices as outlined in authoritative networking literature. Please refer to the IETF RFC 4632 for detailed specifications on IP addressing and subnetting. All calculations are strictly based on the formulas and data provided by this source.

The Formula Explained

The subnet calculator uses the following formulas to determine network parameters:

Network Address: \( \text{IP} \& \text{Subnet Mask} \)

Broadcast Address: \( \text{Network Address} \mid \sim \text{Subnet Mask} \)

Number of Hosts: \( 2^{(32 - \text{Prefix Length})} - 2 \)

Glossary of Variables

  • IP Address: The unique number that identifies devices on a network.
  • Subnet Mask: A 32-bit number that divides the IP address into network and host portions.
  • Network Address: The first address in a subnet.
  • Broadcast Address: The last address in a subnet used to send data to all devices.
  • Number of Hosts: The total number of usable addresses in a subnet.

How It Works: A Step-by-Step Example

Let's assume an IP address of 192.168.1.1 with a subnet mask of 255.255.255.0. The calculator processes these as follows:

  1. Convert IP address and subnet mask to binary.
  2. Perform bitwise AND operation to find the Network Address.
  3. Perform bitwise OR operation with the inverted subnet mask to find the Broadcast Address.
  4. Calculate the number of hosts using the formula \( 2^{(32 - \text{Prefix Length})} - 2 \).

Frequently Asked Questions (FAQ)

What is a subnet mask?

A subnet mask is a 32-bit number that divides an IP address into network and host portions.

How do I calculate the number of hosts in a subnet?

The number of hosts is calculated as \( 2^{(32 - \text{Prefix Length})} - 2 \).

What is the network address?

The network address is the first address in a subnet that identifies the network itself.

What is the broadcast address?

The broadcast address is the last address in a subnet used to send data to all devices within the subnet.

Can this calculator handle IPv6?

This calculator is designed for IPv4. For IPv6, different tools are required due to its different structure and addressing scheme.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
Network Address: \( \text{IP} \& \text{Subnet Mask} \) Broadcast Address: \( \text{Network Address} \mid \sim \text{Subnet Mask} \) Number of Hosts: \( 2^{(32 - \text{Prefix Length})} - 2 \)
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn
Formulas

(Formulas preserved from original page content, if present.)

Version 0.1.0-draft
Citations

Add authoritative sources relevant to this calculator (standards bodies, manuals, official docs).

Changelog
  • 0.1.0-draft — 2026-01-19: Initial draft (review required).