Mega Code Archive

 

Categories / Java / Network Protocol

 

Looking Up the Address of a Host

import java.net.InetAddress; import java.net.UnknownHostException; public class DNSLookup {   public static void main(String args[]) {     try {       InetAddress host;       if (args.length == 0) {         host = InetAddress.getLocalHost();       } else {         host = InetAddress.getByName(args[0]);       }       System.out.println("Host:'" + host.getHostName()           + "' has address: " + host.getHostAddress());       byte bytes[] = host.getAddress();       int fourBytes[] = new int[bytes.length];       for (int i = 0, n = bytes.length; i < n; i++) {         fourBytes[i] = bytes[i] & 255;       }       System.out.println("\t" + fourBytes[0] + "." + fourBytes[1] + "."           + fourBytes[2] + "." + fourBytes[3]);     } catch (UnknownHostException e) {       e.printStackTrace();     }   } }