It's all a game of "Whack-A-Mole". I'm seeing the exact same attack patterns that came from the addresses above coming from other IP addresses as well, in one case with an attack pattern of 15,782 entries coming from two 59.X.X.X addresses.

Just a quick scan of my logs show identical attacks as from the IP addresses above coming from 219.X, 182.X, 221.X, 113.X, 218.X, and the big attack from 59.X ranging from February to April 10.