Illenium

At 14:31 illenium shows his Audio interface ie. komplete audio 6 by native instruments

On his Instagram he has pictures of himself playing live, and it is clear that he uses the MPK249 as in some pictures there are clear shots of the top of the keyboard, as well as the back where it says "AKAI MPK249".

In Illenium's reddit AMA, a user asks Illenium which plugins three plugins he would limit himself to. He responds with "Sylenth, Kontact, and Massive" since he knows those best.

In Illenium's AMA, a user asks which three plugins he would limit himself to. He replies with "Sylenth, Kontact, and Massive".

In Illenium's AMA, a user asks which three plugins he would limit himself to. He replies with "Sylenth, Kontact, and Massive".

The Headphones can be clearly seen at 1:05 into the linked video, and pretty much in every video showing Illenium playing live with his Headphones on. On top of that, i'm an ATH-M50x owner myself and it helped out to spot the item.

In his video of him at Red Rocks 2015 the SPD-SX ca be seen on stage and with him playing with it

In this Instagram video we can see Illenium playing a project made on ableton live 9

he's using it live lol..

In this article by runthetrap, you can see along with his live gear, Illenium also uses Pioneer CDJ-2000 Nexus's

In this Instagram photo we can see Illenium Performing using his macbook pro