I was looking for a list, maybe somebody already had it. Guess I'll be picking them from the urls then.
You'd think people would take something serious around here. Oh well...
Sorry mate. I noticed these codes, fortunately for me I didn't need to use them until now, so I really can't help you. The way they are chosen is pretty much random. The first letter is obviously the first letter from their name, followed by a series of hexadecimal characters, probably the index from the database converted to hexa. There is no pattern to guess there, it's the order in their database. So, one must pick them manually. A lot of hard work.