WhoisThisDomain 是一款免費的網域名稱註冊資料查詢工具。每個網址 (網域名稱) 都有一位所有人，而透過 WHOIS 伺服器就可以查詢到該網址所有人的資料。WhoisThisDomain 可讓您一次輸入多個網址，自動向對應的 WHOIS 伺服器查詢網域名稱所有人、是否已被註冊、註冊到期日等等基本資料。值得一提的是，輸入網址時請省略「www」！
§ 作業系統：Windows 2000/XP/2003/Vista/2008/7/8
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WhoisThisDomain 原文簡介：
WhoisThisDomain is a domain registration lookup utility allows you to easily get information about a registered domain. It automatically connect to the right WHOIS server, according to the top-level domain name, and retrieve the WHOIS record of the domain. It support both generic domains and country code domains and now it can detect more domain privacy services.
This utility doesn’t require any installation process or additional DLLs. Just put the executable file (WhoisTD.exe) anywhere you like, and run it. When running it, the “Choose Domains" window appears. You can type a single domain, or multiple domains separated by commas, space characters, or enter characters. After pressing the ‘OK’ button, it starts to retrieve the domain registration records for the domains that you typed.