为什么我查询yahoo、baidu的whois信息，查询不到？
用whois.crsnic.net和COM.whois-servers.net服务器查询著名网站，只能得到类似以下的信息，没有注册人、注册时间，甚至更详细的信息在哪个whois服务器上，都没有~
yahoo、baidu的whois信息如下：
省略若干……"YAHOO.COM.ZZZZZZZ.GET.ONE.MILLION.DOLLARS.AT.WWW.UNIMUNDI.COM"省略若干……
省略若干……"BAIDU.COM.ZZZZZZ.COM.MORE.INFO.AT.WWW.BEYONDWHOIS.COM"省略若干……
而查询其他的网站就可以得到详细些的信息，比如abcd.com，可以查到注册时间，虽然不是最全面的，但提供了Whois Server: whois.melbourneit.com，继续追查可以得到详细的
whois.crsnic.net、COM.whois-servers.net是不是有问题？！为什么它上面的信息这样不靠谱？！怎样才能查到靠谱的信息？
百度查询信息全文：
Whois Server Version 2.0Domain names in the .com and .net domains can now be registeredwith many different competing registrars. Go to http://www.internic.netfor detailed information.BAIDU.COM.ZZZZZZ.COM.MORE.INFO.AT.WWW.BEYONDWHOIS.COMBAIDU.COM.ZZZZZ.GET.LAID.AT.WWW.SWINGINGCOMMUNITY.COMBAIDU.COM.S18.4BO.CNBAIDU.COM.MORE.INFO.AT.WWW.BEYONDWHOIS.COMBAIDU.COM.CNBAIDU.COMTo single out one record, look it up with "xxx", where xxx is one of theof the records displayed above. If the records are the same, look them upwith "=xxx" to receive a full display for each record.>>> Last update of whois database: Mon, 30 Jan 2012 17:30:28 UTC <<<NOTICE: The expiration date displayed in this record is the date the registrar's sponsorship of the domain name registration in the registry is currently set to expire. This date does not necessarily reflect the expiration date of the domain name registrant's agreement with the sponsoring registrar. Users may consult the sponsoring registrar's Whois database to view the registrar's reported date of expiration for this registration.TERMS OF USE: You are not authorized to access or query our Whois database through the use of electronic processes that are high-volume and automated except as reasonably necessary to register domain names or modify existing registrations; the Data in VeriSign Global Registry Services' ("VeriSign") Whois database is provided by VeriSign for information purposes only, and to assist persons in obtaining information about or related to a domain name registration record. VeriSign does not guarantee its accuracy. By submitting a Whois query, you agree to abide by the following terms of use: You agree that you may use this Data only for lawful purposes and that under no circumstances will you use this Data to: (1) allow, enable, or otherwise support the transmission of mass unsolicited, commercial advertising or solicitations via e-mail, telephone, or facsimile; or (2) enable high volume, automated, electronic processes that apply to VeriSign (or its computer systems). The compilation, repackaging, dissemination or other use of this Data is expressly prohibited without the prior written consent of VeriSign. You agree not to use electronic processes that are automated and high-volume to access or query the Whois database except as reasonably necessary to register domain names or modify existing registrations. VeriSign reserves the right to restrict your access to the Whois database in its sole discretion to ensure operational stability. VeriSign may restrict or terminate your access to the Whois database for failure to abide by these terms of use. VeriSign reserves the right to modify these terms at any time. The Registry database contains ONLY .COM, .NET, .EDU domains andRegistrars.