To use: Input IP Address in dotted-decimal format (e.g. 10.0.0.1). Classful calculation is based on classful network addressing architecture. Classful networking was used until the introduction of CIDR (classless inter domain routing). Calculations are given instantly when typing. Invalid input gives no results. Calculator will assume that unfinished IP addresses end with zeros. Network class will be determined automatically. Only Network classes A,B and C will calculate results. For classes network calculations, please use CIDR calculator, for route aggregation, please use Supernet calculator.

The MASK is binary number (also usually represented in dotted-decimal format) used to separate network and host parts in IP address. IPv4 subnet mask is 32 bits large. In a valid subnet mask network part is represented with "1" from left side followed and ended by host part "0" - 11111111.11111111.11111111.00000000 (binary form), 255.255.255.0 (dotted-decimal form) or simply "/24" (where 24 represents that subnet network part is 24 bits long). Subnet calculator allows calculation for 255.255.255.254.


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Subnet bits are the number of bits used to identify subnet. IP network is divided into network prefix and host identifier. Host bits are there to identify hosts and it is divided into subnet and host identifier.

This is the Reserved Address that represents the Network. It is destination part of the IP routes and it cannot be assigned to host as an identifier. Network ID is calculated by using bitwise AND between IP address and subnet mask.

Given my general lazyness in all things requiring pen and pencil; I like many others am prone to using a subnet calculator in day to day network building. That and when you think about it.. which is more likely to be correct, a computer with static algorithms or a coffee-fueled network administrator adding things up in his head? ?

It nicely grabs a list of all the IP (v4 and v6) addresses on the local machine and adds them to a drop down box so you can quickly check your own subnets, or just clear the address box and type in your required range.

This subnet calculator takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. By giving a second netmask, you can design subnets and supernets. It is also intended to be a teaching tool and presents the subnetting results as easy-to-understand binary values.


In this article, I have compiled a list of 5 free IP subnet calculator software for Windows. These IP subnet calculators will display a list of IP addresses of each host in a subnet, Subnet ID (network ID), and maximum number of subnets that you can create. The best part is that most of them even allow you to export this IP addresses list as HTML, PDF, TXT files, etc or directly copy them to Windows clipboard. All of them are very easy to use and you just have to specify a couple of parameters like IP address, a maximum number of hosts required, etc and then they will show you number of hosts and range of IP addresses that you can assign to all hosts in a subnet.

IP subnet calculator is another free subnet calculator software for Windows. It is a very simple subnet calculator that will tell you the total number of subnets that you can create, and their IP addresses.

Download it from the link provided above and install it. After that, on its main interface (as shown above), specify an IP address in IP-configuration section and then specify Netzmask (Netmask/Subnet mask) in Netmask-Configuration section. Now, click on Start button and it will then calculate and display the total number of subnets that you can create and you can also see the ID of these subnets in Available Subnets section. It also displays other useful info, like, total number of client addresses and the broadcast address.

Advanced IP Address Calculator is another free subnet calculator software for Windows. The best part is that it will display information of each subnet like its IP address, a range of IP addresses that you can allocate to each host in a subnet, and broadcast address of each subnet. It also gives you the option to copy the subnet info to clipboard.

TechExams.net- IP subnet calculator is another simple IP subnet calculator software in my list. As other subnet calculators in this article, it also calculates the total number of subnets that you can create, and displays info of each of these subnets. It will display each subnet ID, IP address of the first and last host in the subnet, and broadcast address for each of these subnets.

Advanced Subnet calculator is another advanced IP subnet calculator software that calculates the total number of subnets and IP address of each host in a subnet. The best part is that it allows you to export the subnet info as TXT, RTF, PDF, HTML, and MHTML file. You can also use it to calculate CIDR, classful subnets, and find IP address details.

Download it from the link provided above and then install it. After you have installed this free subnet calculator, open it and you will see its main interface as shown in the main screenshot added above. Switch to Subnet Addresses tab and specify an IP address, subnet mask, and then click on the Generate Addresses button. It will then calculate subnets and displays IP address of each host in a subnet.

To export the subnet info list, click on the Export button that appears on top of its interface and then select a file format. You can also directly copy the IP addresses list to the clipboard by clicking on the Copy button.

In this article I introduced you to 5 free IP subnet calculator software which calculate subnet info and some of them even allow you to export it. If you are looking for advanced subnet calculators then I will recommend you to go with Advanced IP address calculator, and Advanced Subnet calculator as they also allow you to calculate CIDR and convert IP addresses to different notations.

Bitcricket IP Calculator is a Windows program that enables users to perform various network-related calculations. They can enter the IP in IPv4 or IPv6 format and get the correct subnet address that needs to be used on when establishing a connection.

The main goal of this application is to calculate the subnets. All you need to do is enter an IP address, select the maximum number of subnets and desired hosts. This input will give you a complete table of subnets along with their bit-by-bit addresses.

IP Subnet Calculator allows you to compute subnetting information. You can type any IP address and the program will classify the IP automatically. The main window contains four tabs: Address Info, Subnet Info, Subnet/Hosts and CIDR. In the Address Info tab you can select address types from class A, B, C, and D, showing the range of IP addresses, and the binary, and hexadecimal equivalents of addresses entered. It includes a color-coded class bit map that shows the role of bits in the address class (also shows the Ethernet multicast address for class D addresses only); Subnet Info tab allows you to determine the number of subnet bits to use when creating the subnet mask by selecting subnet, mask bits, subnet mask, max subnets, max and hosts per subnet, showing the subnet bit map, host address range, ID, and broadcast. The Subnet/Hosts tab shows the information of the current IP address scheme showing all the range of IPs, their ID, range, and broadcast. The CIDR tab(Classless Inter Domain Routing) allows you to select mask bits, super net mask, max super nets, and max addresses, showing the route and super net address range.

To start out, go to my GitHub to download the Python subnet calculator project and review the READMEs provided. This will ensure proper steps have been taken to minimize issues or errors from missing dependencies.

Then each possible subnet mask is handled through own specialized function. The newer version is simple if - elif conditional where it loops back to the beginning if a subnet mask is matched but the IPs are not in the same subnet because the user entered a broadcast address which is not an assignable IP.

It then confirms that the fourth octet for both IP addresses are not in the list of network addresses. Then it is passed in another function that searches the range in between the network and broadcast address in each subnet to validate whether both IPs in the fourth octet are within that range.

The only difference is the else statement which the mechanics of this function are very similar to the ip_ran(): function. The big difference that simplified and improved version 2.0 is that all the subnet ranges are passed into a singular function that manipulates the passed in range to search in between the start (network address) and stops 1 value before the next increment (broadcast address). 006ab0faaa

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