static getReverseDNS (req, res) {
    dns.reverse(req.query.ip, (err, data) => {
      if (err) {
        return res.send('reverse error');
      }
      return res.send(data.join(', '));
    });
  }
GET - /api/reversedns

Retrives the domain names associated with an IP address.
@name /reversedns
@param {string} ip - The IP to search domain names for.
@returns {string} domains - A comma separated string list of all the matching domain names.