You have an IP address that you need to resolve into a hostname. The System.Net.Dns class is provided for simple DNS resolution functionality. The Resolve method returns an IPHostEntry that can be used to access the hostname via the HostName property.

In the following code, an IP address is passed resolved, and the hostname is printed to the console:

using System;
using System.Net;

//...

// use the Dnss class to resolve the address
IPHostEntry iphost = Dns.Resolve("127.0.0.1");

// HostName property holds the hostname
string hostName = iphost.HostName;
Console.WriteLine(hostName);

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