AD Research Wiki:

User agent %
DotBot/1.1 47.14
DotBot/1.2 34.53
Mozilla/5.0 15.96
SemrushBot/1.2~bl 0.94
BUbiNG 0.45
YandexBot/3.0 0.45
GoogleOther) 0.07
MSIE 7.0 0.05
ImagesiftBot 0.05
PetalBot 0.05
Others 0.31