About CIDR Calculator

CIDR Calculator helps you calculate important information from an IP block written in CIDR notation (example: 192.168.1.0/24). CIDR is widely used in networking to describe IP ranges, subnet masks, and how many IP addresses exist inside a network. This tool is useful for configuring routers, firewalls, VPNs, servers, and internal LAN networks.

What You Get From CIDR Calculation

• Network address and broadcast address
• Subnet mask (example: 255.255.255.0)
• Total IP count and usable host count
• First and last usable IP range

How to Use

1. Enter a CIDR block (example: 10.0.0.0/16)
2. Click Calculate
3. View network range, mask and usable hosts

FAQ