The Horadric Tome

Weapons ranges for melee chars and mercs

Credits to Marieusz member of d2jsp.

Range = weapon rangeadder + size of the enemy

Monsters size 1 to 3, players, mercs and summons are size 2 (revives depends on size of the mob)

0 to 4 are the weapons ranges adders, 

When dual wielding the primary weapon range adder is used (always)

With range adder 4 attacking a unit size 3 you can hit at 7 sub tile range depending on where you are located, as you can see from the picture Diablo II uses isometric graphics on a diagonal grid, you get slightly less range on the vertical/horizontal axis.

Hope you guys enjoy the quick post, have fun and good luck on drops.