IPv4 Subnets

In my opinion there are three stages of IPv4 subneting:

  1. Learning
  2. Mastered
  3. Too tired / busy / lazy to care

We've all been through (or are going through) the "Learning" stage, most of us have "Mastered" the process and many of us are now "too tired / busy / lazy to care any more". Seeing as how I fall firmly in to stage three, I decided to create my own IPv4 Subnets reference page for myself and for others in stage one.

A while ago I came across Daniel Miessler's blog and his A Subnetting Tutorial and Primer page and the more I looked at his table, the more that I liked it. However, I didn't like the fact that it was a graphic, as opposed to an HTML table, so I decided that someday I'd create my own version. Well, tonight was the night. I decided to add what I'm calling Hexmasks, which is the hexadecimal representation of the netmask. I also added Cisco Wildcard representation as I do occasionally work with Cisco equipment. Then I decided to rotate the table and create one for all 32 bits of the IPv4 address space. Don't get me wrong, I really do like the idea of scrolling horizontally in the table like Daniel's and my first table. However, having a table with 39 columns isn't conducive to a usable web page. (We humans seem to prefer to scroll up and down rather than side to side.)

So, there you have it, my IPv4 Subnets reference page for myself and for others in stage one. Enjoy.