AD Research Wiki:

User agent %
DotBot/1.1 47.82
DotBot/1.2 34.97
Mozilla/5.0 14.85
SemrushBot/1.2~bl 0.95
BUbiNG 0.46
YandexBot/3.0 0.45
MSIE 7.0 0.05
GoogleOther) 0.05
ImagesiftBot 0.05
PetalBot 0.05
Others 0.29