This one is strictly for the network engineers. Noting the simple pattern in network masks, I sketched a grid to simplify the conversion of IP notation between
dotted-decimal and
CIDR notation, eliminating the need for a tedious CIDR listing of all 32 possibilities.
The dimensions are that of a US dollar, so it can be printed into a convenient wallet size.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAKUu4YnKFduq8368dSfqbGlDqeS1uGIUb0lZaSn8t0iWEJkyinGNKkFUflZ1r0Q2V5CDVsOFZxI-6EFdbkoa3Z0WJVg6dRqDzE1XfbpgJMZSepIiVaWBXsJ6FuswZGYGN1Re5spyfhD0/s320/ip_mask_grid_04.jpg)
Let me know if you find this useful.