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)

百度网页搜索 User-agent

Baiduspider 

无线搜索 User-agent

Baiduspider-mobile 

图片搜索User-agent 

Baiduspider-image 

视频搜索 User-agent

Baiduspider-video 

新闻搜索 User-agent

Baiduspider-news 

百度搜藏 User-agent

Baiduspider-favo 

百度联盟 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



百度爬虫，第二条为百度图片爬虫

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

Baiduspider-image

google爬虫，最后一条为google图片搜索爬虫

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)

Googlebot-Image/1.0

即刻搜索爬虫

Mozilla/5.0 (compatible; JikeSpider; +http://shoulu.jike.com/spider.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,第三条为搜狗图片爬虫

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)

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

搜搜爬虫

Sosospider+(+http://help.soso.com/webspider.htm)

网易有道爬虫

Mozilla/5.0 (compatible; YoudaoBot/1.0; http://www.youdao.com/help/webmaster/spider/; )

MSN爬虫

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

 补充:

1.百度Spider