谷歌google:Googlebot
http://www.google.com/bot.html
百度baidu:Baiduspider
http://www.baidu.com/search/spider.htm
雅虎yahoo!:Yahoo!+Slurp
http://misc.yahoo.com.cn/help.html
MSN:msnbot
http://search.msn.com/msnbot.htm
网易有道youdao:YoudaoBot
http://www.youdao.com/help/webmaster/spider/
搜狗sougou:Sogou+web+spider