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To know if the web is in the blacklist (Blacklist Lookup) with this tool for SEO, we have the option of being able to have a blacklist that has been used in a very wide way, which in addition has a quite high precision, here we have compiled the IP addresses of servers of electronic mail that have had an activity that can be compared with the spammers.
Check the IP address of your site and if it is on a blacklist, although that does not mean exactly that you are a spammer. However, when an IP is on a blacklist, it is most likely to have very bad reputation metrics, and it is precisely for this purpose that we can use this tool.
What you should do is enter the IP address of your server through "Blacklist Lookup", then start checking the IP address and you will be told if you are blacklisted ... Or not.