I find the bit mask to be interesting. I'm a network guy, so I'm use to talking about subnet mask and sub-domains. I'm assuming the concept is much the same here. for instance if you have subnet 255.255.255.0 then the nodes in your network will be in the range of that last octet. More specifically up to 254.
With a google search
== discussions / opinions ==
python bit mask explained site:stackoverflow.com
The man behind bit mask. Guys shouldn't this work?