The Diablo 2 Wiki archive is available for anyone looking for information on Diablo 2. All information here is pre-D2R but contains a lot of useful information that is still relevant. Updated sections for new D2R features can be found on the PureDiablo Diablo 2 section
As with the maximum defense question, there's no point in figuring the highest to/hit, since above a certain level, players will hit with every attack. (Note that 5% of attacks will always miss, as an automatic game value for all monsters.)
