Comment by mminer237

It works for me now. It checks if any other domains have been registered to trick people into thinking it's your website.

For example, I put in one of my websites (https://packetlosstest.com), and it gives the following:

  Domain              IPs             HTTP banner            WHOIS
  
  packetlosstest.arab 127.0.53.53
  
  packetl.osstest.com 54.161.222.85
                      34.205.242.146
  
  packelosstest.com   103.224.182.210 Apache/2.4.38 (Debian) Domain Name: PACKELOSSTEST.COM
                                                             Registry Domain ID: 2659396158_DOMAIN_COM-VRSN
                                                             Registrar WHOIS Server: whois.dynadot.com
                                                             Registrar URL: http://www.dynadot.com
                                                             …
  
  packetlos.stest.com 59.110.61.108   nginx
  
  packetlo.sstest.com 54.161.222.85
                      34.205.242.146
  
  packetlosstest.com  34.196.254.27   Netlify                Domain Name: PACKETLOSSTEST.COM
                      35.229.48.116                          Registry Domain ID: 2374572514_DOMAIN_COM-VRSN
                                                             Registrar WHOIS Server: whois.namesilo.com
                                                             Registrar URL: http://www.namesilo.com
                                                             …

The last one is my actual site, and the other five are apparently scammers preparing to impersonate me.