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NetworkUtils
using System;
using System.Security;
using System.Net;
using System.Net.Sockets;
namespace Demo
{
public class NetworkUtils
{
/// <summary>
/// Performs a hostname lookup from an IP.
/// </summary>
/// <param name="Ip"></param>
/// <returns></returns>
public static string GetHostnameFromIp(string Ip)
{
string hostname = "";
try
{
IPHostEntry ipHostEntry = Dns.GetHostByAddress(Ip);
hostname = ipHostEntry.HostName;
}
catch (FormatException)
{
hostname = "Please specify a valid IP address.";
return hostname;
}
catch (SocketException)
{
hostname = "Unable to perform lookup - a socket error occured.";
return hostname;
}
catch (SecurityException)
{
hostname = "Unable to perform lookup - permission denied.";
return hostname;
}
catch (Exception)
{
hostname = "An unspecified error occured.";
return hostname;
}
return hostname;
}
/// <summary>
/// Performs an IP lookup from a hostname.
/// </summary>
/// <param name="Hostname"></param>
/// <returns></returns>
public static string GetIpFromHostname(string Hostname)
{
string ip = "";
try
{
IPHostEntry ipHostEntry = Dns.Resolve(Hostname);
if ( ipHostEntry.AddressList.Length > 0 )
{
//ip = ipHostEntry.AddressList[0].Address.ToString();
ip = ipHostEntry.AddressList[0].ToString();
}
else
{
ip = "No information found.";
}
}
catch ( SocketException )
{
ip = "Unable to perform lookup - a socket error occured.";
return ip;
}
catch ( SecurityException )
{
ip = "Unable to perform lookup - permission denied.";
return ip;
}
catch ( Exception )
{
ip = "An unspecified error occured.";
return ip;
}
return ip;
}
}
}
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