CIDR

CIDR Notation Practice

Master CIDR notation conversion, subnet calculations, and network addressing with interactive tools.

Back to Practice Next Lesson

Subnet Calculator

IPv4 Address

CIDR Prefix

Network Results

Network Address: 192.168.1.0/24

Wildcard Mask: 0.0.0.255

Host Range: 192.168.1.1 - 192.168.1.254

Usable Hosts: 254

CIDR Challenge

Challenge Description

Given a network 10.10.0.0/16 and a requirement for 4 subnets, calculate:

• New subnet mask
• Number of hosts per subnet
• All four network addresses

Your Solution

Subnet Mask

Hosts/Subnet

Subnets Created

Need Practice Tips?

Remember: CIDR notation (/24) defines network bits. Subtract from 32 to find host bits. 2^(host bits-2) gives usable hosts. Practice with different /20 and /28 scenarios.

Subnetting Review →