Download Subnet Calculator

This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) and IPv6 subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others.

A subnet is a division of an IP network (internet protocol suite), where an IP network is a set of communications protocols used on the Internet and other similar networks. It is commonly known as TCP/IP (Transmission Control Protocol/Internet Protocol).

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The act of dividing a network into at least two separate networks is called subnetting, and routers are devices that allow traffic exchange between subnetworks, serving as a physical boundary. IPv4 is the most common network addressing architecture used, though the use of IPv6 has been growing since 2006.

An IP address is comprised of a network number (routing prefix) and a rest field (host identifier). A rest field is an identifier that is specific to a given host or network interface. A routing prefix is often expressed using Classless Inter-Domain Routing (CIDR) notation for both IPv4 and IPv6. CIDR is a method used to create unique identifiers for networks, as well as individual devices. For IPv4, networks can also be characterized using a subnet mask, which is sometimes expressed in dot-decimal notation, as shown in the "Subnet" field in the calculator. All hosts on a subnetwork have the same network prefix, unlike the host identifier, which is a unique local identification. In IPv4, these subnet masks are used to differentiate the network number and host identifier. In IPv6, the network prefix performs a similar function as the subnet mask in IPv4, with the prefix length representing the number of bits in the address.

The IP Subnet Mask Calculator enables subnet network calculations using network class, IP address, subnet mask, subnet bits, mask bits, maximum required IP subnets and maximum required hosts per subnet.

Results of the subnet calculation provide the hexadecimal IP address, the wildcard mask, for use with ACL (Access Control Lists), subnet ID, broadcast address, the subnet address range for the resulting subnet network and a subnet bitmap.

The subnet calculator lets you enter a subnet range (CIDR) and see IP address information about that range You can type your range directly in CIDR notation, or use the optional Mask pull-down:

This is a useful feature for service providers and network operator who frequently allocate and work with subnets. CIDR stands for Classless Inter-Domain Routing, and refers to the standard of dividing the entire IP address space into smaller networks of variable size.

A subnet mask is a 32-digit number determining the possible range of IP addresses available in a network. One subnet mask limits how many IP addresses can exist on a single network, but multiple subnet masks can be used to organize an entire network into sub-subnets.

One popular way of representing a subnet mask is by using Classless Inter-Domain Routing (CIDR) notation. The notation is simply a count of how many network bits (which are set to 1) there are within the subnet mask. So if there are 8 bits in the subnet mask, the CIDR number is 8. When it comes to notation, the CIDR number will usually follow the IP address and will be separated from it by a slash.

Broadly speaking, the purpose of subnetting is to take a network and split it into multiple smaller networks to free up more public IP addresses and to simplify network security and management since networks are now segmented.

IPv4 and IPv6 subnetting are quite similar when it comes to their basic IP subnetting principles. Both should be thought of as binary and both can be simplified with the use of an IP subnet calculator. The only significant difference between the two comes down to scale and, to a lesser degree, their complexity. Unlike IPv4 addresses, IPv6 addresses are 128-bit in length. That includes 16 bits specifically designated for subnetting, which come after the most significant 48 bits that are already allocated to the network identifier. That means the most important 64 bits represent the network identifier, while the less important 64 bits are representative of the host identifier.

A supernet calculator is a form of IP calculator that focuses just on the supernet and not on the individual subnets that it may contain. When you input networks into the IP calculator, it will summarize the supernet and exclude any invalid networks.

The process of subnetting simply means creating a subnetwork (or subnet) within a network. All of the network devices and interfaces within a subnet can communicate directly while routers facilitate communication between multiple subnets. An IP range calculator can deliver insights into individual subnets to simplify management.

There comes a time when the network becomes too large to manage and performance numbers hit an all-time low as a result of too much traffic. One of the most effective techniques to solve this network congestion problem is to break the TCP/IP network into smaller, more manageable pieces. The practice of dividing the network is called subnetting, and a tool that can identify these different divisions is called a subnetting calculator.

Every subnet has an address to represent it and these subnets are interconnected via router. The router needs network address and subnet mask to find out whether the incoming IP packet has to be routed to any of its subnetwork. Performing network calculations can be hard at times when you have to consider different parameters as to how many subnets should I have and how many hosts should be in a subnetwork.

The subnet calculator is a handy tool for finding the number of possible subnets for any given network address block. You can choose the combination of subnets and number of hosts per subnet that suits your network and get the host address range and broadcast address for any given subnet mask. Partitioning a large network and allocating IP address ranges to different teams is a task that can be calculated mentally, but it's better to have an option like an IP range calculator or subnet mask calculator to double check your subnet calculations before configuring them in the router.

A co-worker asked me if I knew of subnet calculator that would not only do the math and output the results that you'd typically want, but would also show the results in a form of a graph, or grid of colored in blocks, or something to the effect. He went on to add that it would be cool if the grid of blocks (representations of IPs or subnets) could be selected and manipulated. For example, leisurely lassoing around a group of some unused blocks of a /8 would would have the tool perform math to locate the nearest bit boundary of your selections, and output some results. Maybe a small lasso would result in a /27, or perhaps a /28, or a larger swath would show you a shorter mask. You pick what you like, and perhaps it gives the option to save it for the session. Perhaps it allows you to manipulate the netblock further by clicking or lassoing through a group of used (colored in) blocks to separate them, or drag smaller subnets to different locations of the larger netblock.

I'm a SysAdmin that has always been interested in Flask. I wanted to build something that I would actually use. So I made myself a subnet calculator. I hope to make more cool stuff with Flask. :8080/

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. 2351a5e196