There are many databases on the internet that contain blacklists of IP addresses. If you are an IPS or email service provider, then you 100% will protect your customers from these Blacklisted IPs.
Blacklist Lookup is a tool that looks up a website's IP address to see if it is in an anti-spam database. Use it to check for yourself if your website is blocked from a specific database. Also, check to see if this is the case not marked by anyone.
If you have a website, it is better to check your website status timely to find different databases. Because if any site does not contain spam but is listed on a Blacklist, this will reduce your website's reputation and ranking. If the listed website wants to be removed from Blacklist, first of all, let's check which database is the blocked site and then make the required and necessary changes to that. In short, if someone wants to check if his website is Blacklisted, then use this Blacklist Lookup tool.
Simply, just type your Domain name on the text box and press the Submit button.