public IHttpActionResult GetHostNameByIP(string ipAddress)
{
IDnsQueryResponse result = null;
RecordDto hostName = new RecordDto()
{
IPAddress = ipAddress
};
result = _client.QueryReverse(IPAddress.Parse(ipAddress));
hostName.HostName = result.Answers.PtrRecords().Select(name => name.PtrDomainName.ToString());
return(Ok(hostName));
}