假设，我们想要获得域名的注册日期。此信息可以从 whois.crsnic.net 服务器(在端口 43 上(轻松获取。但是，如果我们想为像 AAA.COM 这样的短域获取此类信息，服务器可能会像这样响应：
Whois 服务器版本 2.0 .com和 .net 域中的域名可以 现在已在许多不同的竞争注册商处注册。转到 http://www.internic.net 了解详细信息。AAA.COM.CN AAA.COM.TW AAA.COM2.CN AAA.COM 要挑出一条记录，请查找它 使用"xxx"，其中 xxx 是上面显示的记录之一。如果 记录是相同的，使用"=xxx"查找它们以获得完整的 显示每条记录。...
显然，这意味着存在具有相同 TLD 基础的相同域。在这种情况下，我如何获得 AAA.COM 的记录？我真的不明白下面是什么意思。
要挑出一条记录，请查找它 使用"xxx"，其中 xxx 是上面显示的记录之一。
现在，我的查询如下所示
$sp = fsockopen ("whois.crsnic.net", 43);
fputs ($sp, "aaa.com'r'n");
如果您发送=aaa.com，您将收到包含以下内容的响应：
Server Name: AAA.COM.CN
Registrar: MELBOURNE IT, LTD. D/B/A INTERNET NAMES WORLDWIDE
Whois Server: whois.melbourneit.com
Referral URL: http://www.melbourneit.com
Server Name: AAA.COM.TW
Registrar: MELBOURNE IT, LTD. D/B/A INTERNET NAMES WORLDWIDE
Whois Server: whois.melbourneit.com
Referral URL: http://www.melbourneit.com
Server Name: AAA.COM2.CN
Registrar: XIN NET TECHNOLOGY CORPORATION
Whois Server: whois.paycenter.com.cn
Referral URL: http://www.xinnet.com
Domain Name: AAA.COM
Registrar: NETWORK SOLUTIONS, LLC.
Whois Server: whois.networksolutions.com
Referral URL: http://networksolutions.com
Name Server: WALDO.NATIONAL.AAA.COM
Name Server: XB.NATIONAL.AAA.COM
Status: clientDeleteProhibited
Status: clientTransferProhibited
Status: clientUpdateProhibited
Status: serverDeleteProhibited
Status: serverTransferProhibited
Status: serverUpdateProhibited
Updated Date: 20-may-2014
Creation Date: 03-aug-1990
Expiration Date: 02-aug-2019
这告诉您aaa.com的合适 whois 服务器是 whois.networksolutions.com 。因此，您应该重试使用该服务器，您将获得详细信息：
Domain Name: AAA.COM
Registry Domain ID:
Registrar WHOIS Server: whois.networksolutions.com
Registrar URL: http://networksolutions.com
Updated Date: 2009-11-19T00:00:00Z
Creation Date: 1990-08-03T00:00:00Z
Registrar Registration Expiration Date: 2019-08-02T00:00:00Z
Registrar: NETWORK SOLUTIONS, LLC.
Registrar IANA ID: 2
Registrar Abuse Contact Email: abuse@web.com
Registrar Abuse Contact Phone: +1.8003337680
Reseller:
Domain Status: clientDeleteProhibited
Domain Status: clientTransferProhibited
Domain Status: clientUpdateProhibited
Domain Status: serverDeleteProhibited
Domain Status: serverTransferProhibited
Domain Status: serverUpdateProhibited
Registry Registrant ID:
Registrant Name: The American Automobile Association, Inc.
Registrant Organization: The American Automobile Association, Inc.
Registrant Street: 1000 AAA Drive
Registrant City: Heathrow
Registrant State/Province: FL
Registrant Postal Code: 32746
Registrant Country: US
Registrant Phone: 407-444-7000
Registrant Phone Ext:
Registrant Fax:
Registrant Fax Ext:
Registrant Email: no.valid.email@worldnic.com
Registry Admin ID:
Admin Name: The American Automobile Association, Inc.
Admin Organization: The American Automobile Association, Inc.
Admin Street: 1000 AAA Drive
Admin City: Heathrow
Admin State/Province: FL
Admin Postal Code: 32746
Admin Country: US
Admin Phone: 407-444-7000
Admin Phone Ext:
Admin Fax:
Admin Fax Ext:
Admin Email: internet.operations@national.aaa.com
Registry Tech ID:
Tech Name: The American Automobile Association, Inc.
Tech Organization: The American Automobile Association, Inc.
Tech Street: 1000 AAA Drive
Tech City: Heathrow
Tech State/Province: FL
Tech Postal Code: 32746
Tech Country: US
Tech Phone: 407-444-7000
Tech Phone Ext:
Tech Fax:
Tech Fax Ext:
Tech Email: internet.operations@national.aaa.com
Name Server: XB.NATIONAL.AAA.COM
Name Server: WALDO.NATIONAL.AAA.COM
DNSSEC: not signed