Jack, I suspect that the only sensible way to get a number is as you did it, by a query. MS documentation is sometimes (often?) a bit adrift, or missing detail.

I guess you counted the "reserved" more acurately than I did on Yelena's list, so it gives 171 when those are discounted. Still not sure how Phil's list fits, maybe I should look again.

Thanks for responding to a comment so long after the question was posed - I'm drifting back gradually through old qotd from before I discovered sqlservercentral, and it's pretty rare to see any response to comments on old stuff.