Get hostname by a byte array containing the IP address

       
import java.net.InetAddress;

public class Main {
  public static void main(String[] argv) throws Exception {
    byte[] ipAddr = new byte[] { 127, 0, 0, 1 };
    InetAddress addr = InetAddress.getByAddress(ipAddr);
  }
}

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Get hostname by a byte array containing the IP address : IP Address « Network Protocol « Java

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