# 43 - Pentesting WHOIS {% hint style="success" %} Learn & practice AWS Hacking:

[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)

\ Learn & practice GCP Hacking:

[**HackTricks Training GCP Red Team Expert (GRTE)**

](https://training.hacktricks.xyz/courses/grte)

Support HackTricks

* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)! * **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks_live)**.** * **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.

{% endhint %} ## Basic Information 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. **Default port:** 43 ``` PORT STATE SERVICE 43/tcp open whois? ``` ## Enumerate Get all the information that a whois service has about a domain: ```bash whois -h -p "domain.tld" echo "domain.ltd" | nc -vn ``` Notice than sometimes when requesting for some information to a WHOIS service the database being used appears in the response: ![](/files/08rOJD3hJMSOjjfPfm4u) Also, the WHOIS service always needs to use a **database** to store and extract the information. So, a possible **SQLInjection** could be present when **querying** the database from some information provided by the user. For example doing: `whois -h 10.10.10.155 -p 43 "a') or 1=1#"` you could be able to **extract all** the **information** saved in the database. ## Shodan * `port:43 whois` ## HackTricks Automatic Commands ``` 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 ``` {% hint style="success" %} Learn & practice AWS Hacking:

[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)

\ Learn & practice GCP Hacking:

[**HackTricks Training GCP Red Team Expert (GRTE)**

](https://training.hacktricks.xyz/courses/grte)

Support HackTricks

{% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://angelica.gitbook.io/hacktricks/network-services-pentesting/43-pentesting-whois.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.