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When you say 'not registered yet' , do you mean that they have never been registered before?
If that is so, then domains that have never registered before don't have any backlinks
If you want to check backlinks on any kind of domains (registered or unregistered) then you can use the free https://moz.com/researchtools/ose/ or the paid Ahrefs.com and Majestic.com (both have limited free uses / day)