dns_check()
  IP to domain (and back) resolving checker.
  
  This scanner can be used to check senders IP address to resolve via
  DNS service. It can be uses asn real scanner or policy scanner.
  
  Usage: dns_check(reverse=False)
  
  Where: reverse can fe used to check also reverse records
  
  Example: dns_check()
  
  New in version 0.8.0.