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Hi,
We spotted this active URL, as Milos pointed out, which was the reason for blocking the domain: devrange.org/y0ilxa3jng.php.
According to Virustotal, there were similar ones active, which supports the assumption that your website has been hacked. (https://www.virustotal.com/cs/domain/oggendsiekte.devrange.org/information/)

We need you to change all passwords (DNS host, FTP, PHPMyAdmin, MySQL, Admin interface, …), delete all the suspicious files, update all systems you might be using, and then PM me and I will unblock your domain :wink: