Find the host of a site by its domain name

Website

However, errors are frequent, and this can have consequences. A lawyer who gets the wrong target and sends a registered letter to the wrong host will waste considerable time for his client, in addition to potentially revealing confidential information to a third party company.
There is a multitude of tools online, but these are just tools. To interpret the results and not be mistaken, you must understand the mechanisms that come into play. I will, therefore, provide you not with a tool, but with a simple, fast and reliable method to find the host of a site at all shots. 
A little essential theory

Host! = Domain name registrar

The first thing to understand, and frequent source of errors: the domain name registrar (also called registrar) is not necessarily the host of the site. The registrar is the company that registered the domain name. Then, the holder of this domain name chooses a host.
It turns out that most registrars have also become hosts, and many hosts have become registrars. Therefore, it is quite common that the registrar and the host are the same company. 

DNS servers! = DNS scores (or entries)

Another source of error: relying on name servers, also called DNS or NameServers. Name servers are the servers responsible for responding to DNS resolution requests: such name resolves to such IP address. Because your computer and its network card do not know what to do with a domain name. To find a website, they need an IP address. So that's the role of these DNS servers.
All registrars provide their DNS servers for free, as do web hosts. Each domain name holder, therefore, has the choice:
•    Or use the name servers of its host
•    Or use the name servers of its registrar
The DNS servers, therefore, do not provide you with any indication per se on the host of the website. You have to interrogate them to find out, and that's where DNS scores come in.
When you visit a site for the first time, your browser queries the DNS servers associated with that site. These send him as a response to the IP address of the site. Now your browser can query the datacenter in Dhaka Bangladesh the site and display the home page for this site.

Method to find the host of a site

Now you understand: you find the IP, you find the host. 
Find the IP to which the site points
If you regularly need to find the web host, you can install the Chrome Website IP extension which will display the IP of the sites you are browsing in, at the bottom right of the screen.
Otherwise, you can use for example the online service MxToolBox which will return the IP resolved by the DNS server associated with the site. Be sure to enter the full site name, so with or without "www" as appropriate.

However, I want to provide you with the complete procedure because as I said in the preamble, these are just tools and you have to understand what you are doing. 

Find out which host owns the IP

Now that we have the IP, it remains to find the host. It turns out that the IP address databases are public. They are managed by regional organizations (1 per continent): RIPE for Europe, ARIN for the United States.
You could go to the organization's website and make your request, but since you are on MxToolBox, take advantage of it: go this time to the ARIN section of MxToolBox (which works for all regions). Enter the IP and observe the result.

Here are all the contact details of the host. 
If however, you should write to him by mail, I invite you to check the address on his website. Sometimes the host has not updated their contact details in the public databases of RIPE or ARIN.

The particular case of Cloudflare

The website can be hidden behind a reverse proxy which is not with the host but is part of a service delivered by another company. The best-known case is that of Cloudflare. This company serves millions of websites and it is not unlikely that you will come across it when looking for a web host. 

Cloudflare is a platform that optimizes the loading times of your site. By acting as an intermediary between the visitor and the site host, Cloudflare can speed up processing while reducing the number of resources consumed on web hosting. Cloudflare can also clean up traffic and therefore further secure your site.
If a site uses Cloudflare, you will not be able to easily find out which is its host. Needless to say, Cloudflare is, therefore, of course, used massively by all sites that wish to remain discreet, thus making their identification more complex.

Host in the legal sense / LCEN Law

In this article, I explained to you how to find the host of a site, but the host in the legal sense of the term is not necessarily the one you believe.
Imagine at random that I am a client at Dhaka Colo :
•    If I have subscribed to a shared colocation services providers in Bangladesh offer, then Dhaka Colo is my host
•    But if I subscribed to a VPS server offer, then I am my host
Because in the latter case, it is I who manage and administer the server and its operating system (with or without the help of the host). This is only a technical intermediary within the meaning of the LCEN law.
A lawyer who would like to send a notification to the host within the framework of this same me should, therefore, address his mail to my address, and not to the address of Dhaka Colo.