Okay, here we go. I just looked this up on comicbook recources, it had it as the following:
Iron Man Vol 1 #1-332
Iron Man Vol 2 #1-13
Iron Man Vol 3 #1-89
Iron Man Vol 4 #1-16
The Invincible Iron Man Vol 1 #17-28
Iron Man: Director of SHIELD #29-35
The Invincible Iron Man Vol 2 #1-present

NOW: this is how they're officially listed on the Marvel website as:
Iron Man Vol 1 #1-332
Iron Man Vol 2 #1-13
Iron Man Vol 3 #1-89
Iron Man Vol 4 #1-14
Iron Man: Director of SHIELD #15-35
The Invincible Iron Man #1-present

I don't know why there's a difference.