How to check if a website is registered?

Question

How can I check if a particular domain (DNS) is available for registration? Basically what I need is to do a WHOIS query. I will make this query in PHP.

Answer 1

Maybe what you need is a WHOIS query.

There is a library called https://github.com/regru/php-whois using a range of services for consultation https://github.com/regru/php-whois/blob/master/src/Phois/Whois/whois.servers.json

Example of use:

<?php
require_once 'vendor/autoload.php';

$sld = 'dominio.com.br';//Dominio que quer verificar

$domain = new Phois\Whois\Whois($sld);

if ($domain->isAvailable()) {
    echo 'Domínio disponível';
} else {
    echo 'Domínio indisponível';
}

Although not mentioned in the repository, it requires.

However if you are not using Composer, in the case of this specific repository you can try to download the https://github.com/regru/php-whois/archive/master.zip and copy the folder src for your project then make the class call so:

<?php
require_once 'src/Phois/Whois/Whois.php';

$sld = 'dominio.com.br';//Dominio que quer verificar

$domain = new Phois\Whois\Whois($sld);

if ($domain->isAvailable()) {
    echo 'Domínio disponível';
} else {
    echo 'Domínio indisponível';
}

Answer 2

You are referring to having the domain registered in competent bodies such as.br registration or to the site being already published?

If it’s domain registration issues, the "whois" command does this, presenting (if available) information about the domain owner, date of registration, expiration, etc...

Already to check if the site is published and online, there are services like the Down For Everyone Or Just Me that show the current status of the site, whether it is online or offline.