User-Agent: Поисковые боты.

Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Googlebot/2.1 (+http://www.google.com/bot.html)
Googlebot-News
Googlebot-Image/1.0
Googlebot-Video/1.0
Googlebot-Mobile/2.1; +http://www.google.com/bot.html)
(compatible; Mediapartners-Google/2.1; +http://www.google.com/bot.html)
Mediapartners-Google
AdsBot-Google (+http://www.google.com/adsbot.html)

Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexImages/3.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexVideo/3.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexMedia/3.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexBlogs/0.99; robot; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexFavicons/1.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexWebmaster/2.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexPagechecker/1.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexImageResizer/2.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexDirect/3.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexDirect/2.0; Dyatel; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexMetrika/2.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexNews/3.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexNewslinks; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexCatalog/3.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexAntivirus/2.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexZakladki/3.0; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexSitelinks; Dyatel; +http://yandex.com/bots)
Mozilla/5.0 (compatible; YandexVertis/3.0; +http://yandex.com/bots)

Mozilla/5.0 (compatible; Mail.RU_Bot/Fast/2.0)

StackRambler/2.0 (MSIE incompatible)
StackRambler/2.0

Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)
Mozilla/5.0 (compatible; Yahoo! Slurp/3.0; http://help.yahoo.com/help/us/ysearch/slurp) 

msnbot/1.1 (+http://search.msn.com/msnbot.htm)
msnbot-media/1.0 (+http://search.msn.com/msnbot.htm)
msnbot-media/1.1 (+http://search.msn.com/msnbot.htm)
msnbot-news (+http://search.msn.com/msnbot.htm) 

Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)