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”)
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