Surprisingly, today I managed to clear the CIDR exclusion hurdle that has been irking me for some time. I found a python library a while ago that did exactly what I wanted, but the effort of porting the library to PHP was far too much to justify the functionality gained.

So I looked at what the library was doing, and after a bit of tweaking this morning before I headed to my dad's for the Bears game, I created a function that did exactly what I need. Cool!