Network calculator - Subnet calculator

Calculate subnet and networks online

Subnet Calculator

IPv4 Subnet Calculator

Calculating subnets can be tricky, especially when you need to look at various parameters to see how many subnets to install and how many hosts to map to a subnet. Each subnet is routed via its own address, the subnets are connected via a router. The router needs the network address and the subnet mask to determine whether it should send incoming IP packets to the subnet.

Our Network calculator

With our network computer you can easily perform test calculations and thus determine the possible configuration. The subnet computer supports the entry of the IP address, the network size and the network mask. Depending on which entry you change, we will recalculate the networks. Calculating subnets or calculating networks is an important tool for anyone who has to do with setting up hosts, servers and routers.

Calculate Subnet

Calculated Network

Value Name Value
Host IP from
Host IP to
Number of IP Addresses 1
Addressable Hosts 1
CIDR Notation
Network address
Network portion

IP Adresses

Address Value
Host No. 1

Copyable Subnet Calculator Report              Quads      Hex                           Binary    Integer
------------------ --------------- -------- -------------------------------- ----------
IP Address:  2CC8565F 00101100110010000101011001011111  751326815
Subnet Mask: FFFFFFFF 11111111111111111111111111111111 4294967295
Network Portion: 2CC8565F 00101100110010000101011001011111  751326815
Host Portion:     00000000 00000000000000000000000000000000          0

Number of IP Addresses:      1
Number of Addressable Hosts: 1
IP Address Range:   -
Broadcast Address: 
Min Host:          
Max Host:          
IPv4 ARPA Domain:  

Knowledge Base

Here we answer questions about server monitoring from Livewatch. If you have a question that we have not yet answered here, please contact us.

Subnet calculator

A subnet calculator is a tool that helps divide an IP address space into smaller networks called subnets. Subnetting is a technique used in IP networks to make addressing and managing devices more efficient. Here are the basic concepts:

  1. IP addresses:

    • IP addresses in IPv4 are represented in four octets (e.g.,, with each octet comprising eight bits.
    • An IPv4 address consists of 32 bits.
  2. Subnetting:

    • Subnetting allows a large IP address space to be divided into smaller networks, called subnets.
    • This helps to use IP address space more efficiently and improve network management.
  3. Subnet mask:

    • The subnet mask consists of a series of 1 bits followed by a series of 0 bits.
    • It defines which parts of the IP address represent the network part and the host part.
    • For example, the subnet mask is equal to 11111111.11111111.11111111.00000000 in binary system.
  4. Subnet Calculator:

    • A subnet calculator allows you to enter an IP address and subnet mask and then calculate the associated subnet information.
    • Typical information that a subnet calculator can provide is the network address, broadcast address, number of available hosts and other relevant information.
  5. Example:

    • Suppose you have the IP address with a subnet mask of and you want to split it into subnets.
    • A subnet calculator would then calculate the network addresses, broadcast addresses and host ranges for each subnet.

Using a subnet calculator is especially important in larger networks to efficiently assign IP addresses, increase network security, and better manage network traffic. It also makes it easier to identify network problems and improves the overall scalability of IP networks.

What is a subnet or subnet mask?

A subnetwork is a subset of a larger IP network that serves to divide the IP address space into logically isolated sections. Dividing a network into subnets provides several benefits, including more efficient address usage, better security, and improved network organization.

Here are the basic components of a subnet and how it works:

  1. IP Addresses: A subnet consists of a range of IP addresses. These addresses are selected from the network's entire IP address space. For example, a network might have the IP address range to

  2. Subnet mask: The subnet mask is a sequence of numbers that indicates which parts of the IP address represent the network portion and the host portion. For example, the subnet mask could be, meaning that the first three octets (192.168.1) represent the network portion and the last octet is reserved for the individual devices on the network.

  3. Logical Isolation: A subnet allows the IP address space to be logically isolated. Devices within the same subnet can communicate directly with each other as if they were on the same physical network. Devices on different subnets typically need to use a router to communicate with each other.

  4. Efficient Address Usage: Using subnets allows the available IP address space to be used more efficiently. Instead of using all IP addresses in one large range, smaller ranges can be reserved for specific parts of the network.

  5. Security: Subnets allow security policies to be applied at the subnet level. Traffic between subnets can be controlled through firewalls and other security mechanisms, improving the security of the network.

For example, a company might have one subnet for office equipment, another subnet for servers, and a third subnet for guest WiFi. This division helps organize network traffic, increase security, and optimize resource utilization.

Calculate subnet - calculation method

The subnet mask is used to divide an IP network into smaller subnets. It consists of a series of 32 bits divided into four octets of 8 bits each. The subnet mask is usually represented in decimal form, with each octet separated by a period (for example,

Here are the steps to calculate a subnet mask:

Decide how many subnets you need:

Consider how many networks or subnets you want to create from your overall network. The number of subnets determines the number of bits required for network division. Determine the number of bits for network sharing:

Count the number of bits needed to represent the number of subnets. These bits are later added to the subnet mask. Calculate the subnet mask in binary form:

Set the required bits in the subnet mask to 1 and pad the remaining bits with 0. Note that the subnet mask always starts with the left bits. For example, if you need 3 bits for network sharing, the binary form of the subnet mask is: 11100000 (for the first octet). Convert binary form to decimal form:

Convert each octet of binary form to the corresponding decimal number to represent the subnet mask in common decimal form. Here is an example: Suppose you want to divide a network into 8 subnets. You need 3 bits for network sharing.

Number of bits for network sharing: 3 bits Binary form of subnet mask: 11100000 (for the first octet) Decimal form of subnet mask: 224 (for the first octet) The full subnet mask for this example would then be

It is important to note that the subnet mask always begins with a series of 1 bits followed by a series of 0 bits. The network and broadcast address bits are always set to 0 and 1, respectively.

Worldwide server monitoring

Our server monitoring instances are located worldwide. So you get a complete picture of your system health and are also informed about disturbances in distant locations.

Load Balancing
Which server monitoring are you looking for?
  • Server Monitoring
  • Uptime Monitor
  • Performance Monitoring
  • Website Monitoring
  • Website-Check
  • Ping Check
  • Server availability
  • Uptime Performance
  • Content Monitoring
  • Monitor server
  • Monitor website
  • DNS-Test
  • Ping-Test
  • Website Speed Test
  • Ip Website
Create an account

Server Monitoring

Continuous monitoring of your website


Detailed logging of the availability of your website

Check Monitoring

Create your own exams and monitor your infrastructure with ease

Start your monitoring now!

Register your account free of charge and without obligation.

Livewatch server monitoring in 60 seconds

Let us explain our server monitoring offer in a 60-second video.

60 seconds of video - all about server monitoring