Is there any advantages in performance that depend on what numbers you use as tags?

I have 4 sets of objects that I am labeling with tags. Is there any reason not to skip numbers? Ie, could I have the first set run from 0 to 99, the second from 1000 - 1099, the third from 2000 - 2099, and the fourth from 100,000 to 100,099?

Note that I'm not actually using nearly this many objects in my code. So I'm not asking about performance issues with having this many objects. I just want to know if its bad to skip tags. It helps me organize my code and my thoughts. Anyone know how the tags are stored?