CIDR Calculator
Calculate IP range, netmask, and more from a CIDR block.
How to use CIDR Calculator
- Enter a CIDR block (e.g., 10.0.0.0/16) in the input field.
- Click the 'Calculate' button.
- View detailed network information including IP range and netmask.
About CIDR
What is CIDR?
Classless Inter-Domain Routing (CIDR) is a method for allocating IP addresses and for IP routing. It replaces the older system based on classes A, B, and C.
CIDR Notation
CIDR notation consists of an IP address, a slash ('/'), and a decimal number. The number is the count of leading 1-bits in the routing prefix mask.
Features
- Calculate Netmask
- Identify First and Last IPs
- Count Total Usable Hosts
Applications
- Network planning
- Subnetting
- Firewall configuration