# IP Subnet Calculator

## Simplify subnetting for IPv4. Our Calculator delivers instant insights into IP, subnet, and network details for efficient analysis.

An IP subnet calculator is a tool that helps you determine the network and host portions of an IP address, as well as the subnet mask and IP class. It is a valuable tool for network administrators, IT professionals, and anyone who needs to work with IP addresses.

### Classless Inter-Domain Routing (CIDR)

CIDR is a method of dividing an IP address space into smaller subnets. This allows for more efficient use of IP addresses and can help to improve network performance. CIDR notation is a way of expressing the size of a subnet. It consists of an IP address followed by a slash (/) and a number, which represents the number of bits in the subnet mask. For example, the CIDR notation 192.168.1.0/24 represents a subnet with a subnet mask of 255.255.255.0.

### How to Use an IP Subnet Calculator

To use an IP subnet calculator, simply enter the IP address and subnet mask into the appropriate fields. The calculator will then return the following information:

The network address is the first address in the subnet. It is used to identify the network to which the host belongs.

Usable host range:

The usable host range is the range of IP addresses that can be assigned to hosts on the network. The first and last addresses in the range are reserved for the network address and the broadcast address, respectively.

The subnet mask is a bitmask that is used to divide an IP address into network and host portions. The subnet mask is expressed in binary notation, with ones representing bits that belong to the network portion and zeros representing bits that belong to the host portion.

IP class:

The IP class is a classification system for IP addresses. There are three classes of IP addresses: A, B, and C. Class A addresses are used for large networks, Class B addresses are used for medium-sized networks, and Class C addresses are used for small networks.

### Benefits of Using an IP Subnet Calculator

There are many benefits to using an IP subnet calculator, including:

Increased efficiency: IP subnet calculators can help you to use IP addresses more efficiently by dividing them into smaller subnets. This can help to reduce the amount of traffic on your network and improve performance.

Improved security: IP subnet calculators can help you to improve the security of your network by isolating different subnets from each other. This can help to prevent unauthorized access to your network resources.

Reduced complexity: IP subnet calculators can help you to reduce the complexity of your network by making it easier to manage and troubleshoot.

### What’s the difference between subnetting and CIDR?

Subnetting and CIDR are both methods of dividing an IP address space into smaller networks. However, they differ in the way they do this.

Subnetting

Subnetting is the traditional method of dividing an IP address space into smaller networks. It involves dividing the host portion of an IP address into smaller subnets. This is done by borrowing bits from the host portion and adding them to the network portion of the address. The number of bits borrowed determines the number of subnets that can be created.

For example, an IP address with a subnet mask of 255.255.255.0 can be divided into 256 subnets. Each subnet will have a host range of 254 addresses.

CIDR

CIDR (Classless Inter-Domain Routing) is a newer method of dividing an IP address space into smaller networks. It uses a slash notation to specify the number of bits in the subnet mask. For example, 192.168.1.0/24 is an IP address with a subnet mask of 255.255.255.0.

CIDR is more efficient than subnetting because it allows for a wider range of subnet sizes. It also eliminates the need for subnet masks, which can be difficult to manage.