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WHOIS协议作为一种标准方法，通过特定数据库查询各种互联网资源的注册者或持有者。这些资源包括域名、IP地址块和自治系统等。除此之外，该协议还应用于访问更广泛的信息。
**默认端口：**43
获取 whois 服务对域名的所有信息：
注意，有时在向WHOIS服务请求某些信息时，响应中会出现正在使用的数据库：
此外，WHOIS服务始终需要使用数据库来存储和提取信息。因此，当从用户提供的信息查询数据库时，可能会存在SQL注入。例如，执行whois -h 10.10.10.155 -p 43 "a') or 1=1#"，您可能能够提取数据库中保存的所有信息。
port:43 whois
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PORT STATE SERVICE
43/tcp open whois?whois -h <HOST> -p <PORT> "domain.tld"
echo "domain.ltd" | nc -vn <HOST> <PORT>Protocol_Name: WHOIS #Protocol Abbreviation if there is one.
Port_Number: 43 #Comma separated if there is more than one.
Protocol_Description: WHOIS #Protocol Abbreviation Spelled out
Entry_1:
Name: Notes
Description: Notes for WHOIS
Note: |
The WHOIS protocol serves as a standard method for inquiring about the registrants or holders of various Internet resources through specific databases. These resources encompass domain names, blocks of IP addresses, and autonomous systems, among others. Beyond these, the protocol finds application in accessing a broader spectrum of information.
https://book.hacktricks.xyz/pentesting/pentesting-smtp
Entry_2:
Name: Banner Grab
Description: Grab WHOIS Banner
Command: whois -h {IP} -p 43 {Domain_Name} && echo {Domain_Name} | nc -vn {IP} 43