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Backlinks, together with content, are the most important factors that influence the performance of your web pages on search engine results pages (SERP).
If that tells you something, it must be that backlinks are superimportant and should be treated that way.
Treating your site's backlinks with the utmost importance they deserve begins with having an idea of what your backlink profile looks like. In other words, you should analyze your backlinks to know where you are and the next level you should take it to.
And that's where a backlinks verification tool comes into play.
The blacklist verification will show if the URL or IP entered is listed with the DNSBL or SURBL systems. E-mail system administrators use these systems to try to delete unwanted e-mail messages before they reach their users. DNSBL is a blacklist of domain names.