Egg, sorry, I voided the other two links.
For the Blacklist Check Link you (FF) need: javascript: void (window.location.href = "https://mxtoolbox.com/SuperTool.aspx?action=blacklist: " + document.getElementById('ipEntry').value );
I've checked your IP and it does come up with two hits.
https://www.blacklistmaster.com/ reports four.
https://www.dnsbl.info/dnsbl-database-check.php has no marketing and I get two again.
I would agreed that as it is dynamic, some earlier user could have been a spammer.
I've never checked mine but feel free.
Acorn
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