Subnetting with the Box Method
For visual learners.
For a /24 network, thats 256 addresses, or … this box.
Start With A /24
Write the first IP in the top corner, the last IP in the bottom corner.
Cut In Half (1)
Write the last number in the bottom corner, next number in the top corner.
Two /25 networks.
Cut In Half (2)
- One
/25 - Two
/26networks.
Cut In Half (3)
- One
/25 - Four
/27
Cut In Half (4)
- One
/25 - Two
/27 - Four
/28