code: function(host, next) {
      var tokens = tldtools.extract(host),
        resolvingHost;
  
      if (ipaddr.IPv4.isValid(host) || ipaddr.IPv6.isValid(host) ) {
        next(false, [ host ], host);
      } else {
        resolvingHost = tokens.inspect.getDomain() || tokens.domain;
        dns.resolve(resolvingHost, function(err, aRecords) {
          next(err, aRecords, resolvingHost );
        });
      }
    }
docs: Returns all ipv4/6 A records for a host