How can I get MAC Address without using the IP in Java?

Question

How can I found the MAC address of a network card without knowing and using the IP address in Java?

[tag:jsp] has nothing to do with it. – user207421 Feb 23 '20 at 07:05 — user207421, Feb 23 '20 at 07:05

score 1 · Answer 1 · answered Apr 11 '17 at 16:51

1

you can use NetworkInterface.getHardwareAddress. You can get the list of all network cards with NetworkInterface.getNetworkInterfaces().

you can use this code for knowing MAC Address.

InetAddress address = InetAddress.getLocalHost();
NetworkInterface nwi = NetworkInterface.getByInetAddress(address);
byte mac[] = nwi.getHardwareAddress();
System.out.println(mac);

answered Apr 11 '17 at 16:51

Anshul Sharma

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I've tried like that but it doesn't work because it takes first the address of Local Loopback in linux. And to be more specific I need just the internet address of the network card which is connected on internet on linux, because on windows works the method gived by you. – Vlad V Apr 12 '17 at 15:00

score 0 · Answer 2 · answered Apr 11 '17 at 16:48

You can use system command like below(if you on nix systems, if your os is windows use ipconfig in a similar way):

Runtime r = Runtime.getRuntime();
Process p = r.exec("ifconfig -u |grep ether");
p.waitFor();
BufferedReader b = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = "";

while ((line = b.readLine()) != null) {
  System.out.println(line);
}

b.close();

On my system it gives:

ether 28:37:37:15:3b:31 
ether b2:00:10:65:56:41 
...

Notice that there are maybe many MAC addresses, the Bluetooth, the Ethernet, the WIFI and so on.

How can I get MAC Address without using the IP in Java?

2 Answers2