Mozilla/5.0 (compatible; AhrefsBot/5.2; +http://ahrefs.com/robot/)
Mozilla/5.0 (compatible; AhrefsBot/5.1; +http://ahrefs.com/robot/)
Mozilla/5.0 (compatible; AhrefsBot/5.0; +http://ahrefs.com/robot/)
Mozilla/5.0 (compatible; AhrefsBot/4.0; +http://ahrefs.com/robot/)
Mozilla/5.0 (compatible; AhrefsBot/5.2; News; +http://ahrefs.com/robot/)
Mozilla/5.0 (compatible; AhrefsBot/5.2; SA; +http://ahrefs.com/robot/)
Mozilla/5.0 (compatible; AhrefsBot/3.0; +http://ahrefs.com/robot/)
Mozilla/5.0 (compatible; AhrefsBot/3.1; +http://ahrefs.com/robot/)
Mozilla/5.0 (compatible; AhrefsBot/2.0; +http://ahrefs.com/robot/)
Random string containing AhrefsBot and some other stuff
"Mozilla/5.0 (compatible; AhrefsBot/5.0; +http://ahrefs.com/robot/)
Mozilla/5.0 (compatible; AhrefsBot/5.0; +http://ahrefs.com/robot/) ASProxy/5.5b4