CIDR Calculator

Visualize and calculate network ranges with IPv4 CIDR blocks. Understand subnetting, network addresses, and host allocations.

CIDR Input

Format: xxx.xxx.xxx.xxx/yy (e.g., 192.168.1.0/24)

Common CIDR Blocks

Enter a valid CIDR notation to see results

Example: 192.168.1.0/24

💡 CIDR Notation

  • Classless Inter-Domain Routing (CIDR) is a method for allocating IP addresses and routing.
  • Example: 192.168.1.0/24 means 256 addresses (192.168.1.0 - 192.168.1.255).
  • The number after the slash (/) indicates the subnet mask length.

Subnetting Tips

  • Use CIDR to efficiently divide networks into subnets.
  • /30 is often used for point-to-point links, /24 for typical LANs.
  • Smaller subnets help isolate network segments for security and performance.

References & Tools