keyplr - I blocked the range 188.8.131.52/21 in 2011 as Serverboost. Looks like a simple takeover/name change. With RIPE records it always pays to scroll down to the end of the record, where it usually gives the full (or at least a larger) range.
184.108.40.206/24 - I have the full /16 blocked with the note: "Seems to be "russia"-operated backbones in /24 blocks?" I had 9 /24 ranges blocked before blocking the full /16.