🧮 IPv4/IPv6 Subnet Calculator – Professional IP Network Tool

Calculate subnet information for both IPv4 and IPv6 networks

The IPv4/IPv6 Subnet Calculator is a simple yet powerful tool that helps network administrators, IT professionals, and students calculate subnet details for both IPv4 and IPv6 addresses. Whether you’re planning a network, performing subnetting, or troubleshooting IP configurations, this calculator provides accurate and instant results.

How It Works

For IPv4:
IPv4 addresses use a 32-bit format divided into four octets (e.g., 192.168.1.1). Each subnet mask defines how many bits are used for the network and host portions — for example, 255.255.255.0 or /24.
With this calculator, you can enter an IPv4 address and subnet mask to instantly see details such as:

• Network address

• Broadcast address

• Number of hosts

• First and last usable IPs

For IPv6:
IPv6 addresses are 128-bit and written in hexadecimal (e.g., 2001:0db8:85a3::8a2e:0370:7334). Instead of a subnet mask, IPv6 uses a prefix length (e.g., /64) to indicate the network portion.
The calculator supports IPv6 subnetting to show:

• Network prefix

• Range of available addresses

• Number of possible subnets and hosts

Key Features

• Dual support for IPv4 and IPv6

• Instant subnet calculations

• Input via IP address and subnet mask / prefix length

• Easy-to-read results for quick analysis

• Ideal for network design, education, and IT troubleshooting

 Why Use a Subnet Calculator?

Subnetting can be complex, especially when working across different IP versions. A subnet calculator simplifies this process by automatically computing:

• Network boundaries

• Host availability

• Proper address allocation

• Efficient network segmentation

It’s an essential tool for anyone managing IP networks, routers, or servers.

💡 Example Usage

IPv4 Example:
Input: 192.168.1.1 with subnet mask 255.255.255.0
Output:

• Network: 192.168.1.0/24

• Broadcast: 192.168.1.255

• Host range: 192.168.1.1 – 192.168.1.254

• Usable hosts: 254

IPv6 Example:
Input: 2001:db8::1 with prefix /64
Output:

• Network: 2001:db8::/64

• Number of subnets: 1

• Total addresses: 18,446,744,073,709,551,616

Enter your IP address and subnet mask or prefix length, then click Calculate to get instant results.
Simplify your network management with the IPv4/IPv6 Subnet Calculator today!