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Categories / C# / Network

 

DNS Reverse Lookup and Lookup

using System; using System.Collections.Generic; using System.Text; using System.Net; //DnsLookup class Program {     static void Output(IPHostEntry ipHostEntry) {         Console.WriteLine("Host: {0}", ipHostEntry.HostName);         Console.WriteLine("\nAliases:");         foreach (string alias in ipHostEntry.Aliases) {             Console.WriteLine(alias);         }         Console.WriteLine("\nAddress(es):");         foreach (IPAddress address in ipHostEntry.AddressList) {             Console.WriteLine("Address: {0}", address.ToString());         }         Console.ReadLine();     }     static void Lookup(string hostname) {         IPHostEntry ipHostEntry = Dns.GetHostByName(hostname);         Output(ipHostEntry);     }     static void ReverseLookup(string address) {         IPHostEntry ipHostEntry = Dns.GetHostByAddress(address);         Output(ipHostEntry);     }     static void Main(string[] args) {         Lookup("www.microsoft.com");         ReverseLookup("172.18.1.1");     } }