如何确定顶级注册商？您可以和原域名注册商或代理商询问，或者查询域名的Whois信息。查询地址是：http://www.zhaomu.com/domain/domain_whois_popup.asp
查询结果举例：
Domain Name: *******
Registrar: XIN NET TECHNOLOGY CORPORATION 说明是新网的域名
Whois Server: whois.paycenter.com.cn
Referral URL: http://www.xinnet.com
Name Server: NS1.MYSUPERDNS.COM
Name Server: NS2.MYSUPERDNS.COM
Status: ok
Updated Date: 18-feb-2008
Creation Date: 18-feb-2008
Expiration Date: 18-feb-2009
Domain Name: *******
Registrar: BEIJING INNOVATIVE LINKAGE TECHNOLOGY LTD. DBA DNS.COM.CN 说明是新网互联的域名
Whois Server: whois.dns.com.cn
Referral URL: http://www.dns.com.cn
Name Server: NS1.MYSUPERDNS.COM
Name Server: NS2.MYSUPERDNS.COM
Status: clientTransferProhibited
Updated Date: 17-feb-2008
Creation Date: 16-mar-2007
Expiration Date: 16-mar-2009
Domain Name: *******
ROID: 20080218s10001s78110963-cn
Domain Status: ok
Registrant Organization: 王丁
Registrant Name: 王丁
Administrative Email: blogdone@163.com
Sponsoring Registrar: 北京新网互联科技有限公司 说明是新网互联的域名
Name Server:ns1.mysuperdns.com
Name Server:ns2.mysuperdns.com
Registration Date: 2008-02-18 13:57
Expiration Date: 2009-02-18 13:57
