各大搜索引擎的User-Agent

baidu：Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html) 
Google：Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Sogou：Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)
Yahoo：Mozilla/5.0 (compatible; Yahoo! Slurp/3.0; http://help.yahoo.com/help/us/ysearch/slurp)
百度網頁搜索 User-agent
Baiduspider 
無線搜索 User-agent
Baiduspider-mobile 
圖片搜索User-agent 
Baiduspider-image 
視頻搜索 User-agent
Baiduspider-video 
新聞搜索 User-agent
Baiduspider-news 
百度搜藏 User-agent
Baiduspider-favo 
百度聯盟 User-agent
Baiduspider-cpro
谷歌User-agent
Googlebot
MSN User-agent
MSNBot
有道User-agent
YoudaoBot
搜狗User-agent
Sogou inst spider
Sogou spider2
Sogou blog
Sogou News Spider
Sogou Orion spider
即刻User-agent
JikeSpider
搜搜User-agent
Sosospider
360User-agent
360Spider

百度爬蟲，第二條爲百度圖片爬蟲
Baiduspider+(+http://www.baidu.com/search/spider.htm")
Baiduspider-image
google爬蟲，最後一條爲google圖片搜索爬蟲
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)
Googlebot-Image/1.0
即刻搜索爬蟲
Mozilla/5.0 (compatible; JikeSpider; +http://shoulu.jike.com/spider.html)
雅虎爬蟲（分別是雅虎中國和美國總部的爬蟲）
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")
新浪愛問爬蟲
iaskspider/2.0(+http://iask.com/help/help_index.html")
Mozilla/5.0 (compatible; iaskspider/1.0; MSIE 6.0)
搜狗爬蟲,第三條爲搜狗圖片爬蟲
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)
Sogou Pic Spider/3.0(+http://www.sogou.com/docs/help/webmasters.htm#07)
搜搜爬蟲
Sosospider+(+http://help.soso.com/webspider.htm)
網易有道爬蟲
Mozilla/5.0 (compatible; YoudaoBot/1.0; http://www.youdao.com/help/webmaster/spider/; )
MSN爬蟲
msnbot/1.0 (+http://search.msn.com/msnbot.htm)

 補充:

1.百度Spider