The IP Subnetting Calculator is a powerful and accurate online tool for calculating IPv4 and IPv6 subnets in just seconds. It provides instant results including network address, broadcast address, subnet mask, first and last host, and total usable hosts per subnet. With the built-in Subnet Summary banner, you can quickly see your network class, address range, and CIDR details all in one view.
This calculator is ideal for students, IT professionals, and network administrators who want to simplify complex subnetting and CIDR calculations. It also includes a helpful CIDR to Subnet Mask reference table for quick learning and verification.
Use this intuitive IP Subnet Calculator to master subnetting, improve your network planning, and gain a deeper understanding of IP addressing structures in both IPv4 and IPv6.
IP Subnetting Calculator
Detailed Results:
Please enter an IP address in CIDR format.
CIDR to Subnet Mask Reference Table (IPv4)
| CIDR | Subnet Mask | # of Hosts |
|---|
An IP subnet is a segmented portion of an IP network that helps organize and manage devices efficiently.
By dividing a larger network into smaller subnets, administrators can improve network performance, security, and address allocation. Each subnet has a unique network address and a defined range of IP addresses for devices.
Subnetting uses a subnet mask or CIDR notation to determine which part of the IP address identifies the network and which part identifies individual hosts. Understanding IP subnets is essential for network design, troubleshooting, and routing.