# 43 - Pentesting WHOIS
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## Basic Information
**WHOIS** (pronounced as the phrase "who is") is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block or an autonomous system, but is also used for a wider range of other information. (From [here](https://en.wikipedia.org/wiki/WHOIS))
**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:
.png)
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: |
WHOIS (pronounced as the phrase "who is") is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block or an autonomous system, but is also used for a wider range of other 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
```
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---
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