详见：

百度爬虫 

* Baiduspider+(+http://www.baidu.com/search/spider.htm”) 

google爬虫 

* Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) 

* Googlebot/2.1 (+http://www.googlebot.com/bot.html) 

* Googlebot/2.1 (+http://www.google.com/bot.html) 

雅虎爬虫（分别是雅虎中国和美国总部的爬虫） 

*Mozilla/5.0 (compatible; Yahoo! Slurp China; http://misc.yahoo.com.cn/help.html”) 

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

新浪爱问爬虫 

*iaskspider/2.0(+http://iask.com/help/help_index.html”) 

*Mozilla/5.0 (compatible; iaskspider/1.0; MSIE 6.0) 

搜狗爬虫 

*Sogou web spider/3.0(+http://www.sogou.com/docs/help/webmasters.htm#07″) 

*Sogou Push Spider/3.0(+http://www.sogou.com/docs/help/webmasters.htm#07″) 

网易爬虫 

*Mozilla/5.0 (compatible; YodaoBot/1.0; http://www.yodao.com/help/webmaster/spider/”; ) 

MSN爬虫 

*msnbot/1.0 (+http://search.msn.com/msnbot.htm”)