Seven-second subnetting is a quick mental calculation method for determining subnet boundaries. Let's say you need to subnet a Class C network (e.g., 192.168.1.0) into four subnets. Using the seven-second subnetting method:

1. Start with the first subnet:

   • 192.168.1.0

2. Add 32 (2^5) to find the next subnet:

   • 192.168.1.32

3. Add 32 again for the third subnet:

   • 192.168.1.64

4. And once more for the fourth subnet:

   • 192.168.1.96

This method is a rapid way to identify subnet boundaries without performing detailed binary calculations. It leverages the fact that many subnetting scenarios involve powers of 2, making it convenient for quick mental calculations.