Only the An-225 does not have a tail ramp. Judging from the size, it is either an An-22, An-124 or Il-76. It's not an Il-76, and those red things are covers for a jet engine, leaving only the An-124. The crane is a dead giveaway, that particular model is only found in the big Antonovs. The An-22 also has no padding/isolation on the walls, and the hold of that one is painted blue on the bottom and yellow on the top.
Now, how do I know that it's the rear ramp, and not the front ramp, which is identical on both the An-124 and An-225, and looks/operates very much like the rear ramp? Well, the An-124 has stairs leading to the upper deck in the rear and front of the main cargo deck. The front stairs are parallel with the fuselage, the rear stairs are perpendicular to the fuselage. Therefore, this photo shows the rear ramp on an An-124.
