CIDR Calculator

CIDR Calculator

The CIDR Calculator is a powerful tool designed to help users understand and manipulate Classless Inter-Domain Routing (CIDR) notation. CIDR is a method used to allocate and specify IP addresses and subnets, allowing for efficient use of IP address space. It encompasses concepts such as IP addresses, subnet masks, and IPv4 addressing.

CIDR notation consists of an IP address followed by a forward slash and a number, denoting the number of significant bits in the routing prefix. For more information, you can refer to the Wikipedia page on CIDR.

Benefits of CIDR Calculator:

  • Efficient allocation of IP address space
  • Precise subnetting and network configuration
  • Streamlined IP address management

How to Use CIDR Calculator:

  1. Enter the IP address in CIDR notation (e.g., into the input field.
  2. Click the “Calculate” button to generate CIDR information and IP address range.
  3. Review the results in the table displayed below.

Example: Entering “” will calculate CIDR information for the subnet with a 24-bit prefix.

Frequently Asked Questions (FAQs):

  • Q: What is CIDR?
  • A: CIDR stands for Classless Inter-Domain Routing, a method for allocating IP addresses and defining subnets.
  • Q: How does CIDR differ from traditional IP addressing?
  • A: CIDR allows for variable-length subnet masking, offering more flexibility in IP address allocation compared to traditional class-based addressing.
  • Q: Can I use CIDR notation for IPv6 addresses?
  • A: Yes, CIDR notation can also be used for IPv6 addresses to specify routing prefixes.

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