User blog comment:RoznosicielCiast/Some really important things/myths about Darius/@comment-5266525-20130227112851

"Short word about range. It's 550. Highest AA range in game belongs to Caitlyn (650), which is the only champion that can kite him and propably not get pulled from level 1. In mid and late game, Tristana, Kog'maw and Twitch can also do it."

I can't count the number of times I've had to correct this kind of mistake.

Ability ranges are calculated from the center of your model, while autoattack ranges are calculcated from the edge. In practice this means autoattacks are about 100 units longer than an equivalent ability range.

Skip to 1:55 of this video. Darius whiffs on Sivir, who has the shortest autoattack range of any traditional ADC period, at 500. If that's not proof nothing is.