there are loadsa whocalledme type websites if you wanted more info - assuming someone has already posted the number. So many websites you have to look at a few to make it informative.

There is a problem with the reported numbers, not sure it is still true but numbers can be cloaked/spoofed and would suspect the spammers/scammers have a list of unused/impossible numbers. Impossible numbers exist for error checking in mis-dialling or errors in the transmission system.