IP Subnet Calculator

Networking Tools

Calculate IP address subnets, CIDR notation, network ranges, and broadcast addresses. Essential networking tool for IT professionals and network administrators.

How to Use IP Subnet Calculator

Enter an IP address in the format xxx.xxx.xxx.xxx (IPv4) or hexadecimal format (IPv6). Specify the subnet mask either as a decimal (e.g., 255.255.255.0) or CIDR notation (e.g., /24). Click "Calculate" to generate subnet information including network address, broadcast address, usable IP range, and total available hosts. Use the "Copy Results" button to save detailed information.

Frequently Asked Questions

What is CIDR notation and how does it work?

CIDR (Classless Inter-Domain Routing) notation uses a slash followed by a number (e.g., /24) to indicate the subnet mask bit count. For example, /24 equals 255.255.255.0, allowing 256 addresses with 254 usable hosts.

How do I determine the appropriate subnet for my network?

Choose your subnet based on the number of required hosts. For example, a /24 subnet provides 254 usable addresses, while a /26 provides 62. Our calculator shows available hosts for each subnet mask to aid planning.

Does this calculator support IPv6 subnetting?

Yes, our calculator fully supports both IPv4 and IPv6 subnetting calculations, providing comprehensive information for both addressing schemes used in modern networks.