IP Address not obtained in java

Question

This code used to return my local ip address as 192.xxx.x.xxx but now it is returning 127.0.0.1 . Please help me why the same code is returning different value. Is there som

Answer 1

When you use InetAddress.getLocalHost() you are not guaranteed to get a particular interface, ie. you could receive the loopback (127) interface or a connected one.

In order to ensure you always get an external interface, you should use the java.net.NetworkInterface class. The static getByName(String) class will give you the interface with the defined name (such as "eth0"). Then you can use the getInetAddresses() function to obtain the IP addresses (could be just one) bound to that interface.

NetworkInterface ni = NetworkInterface.getByName("eth1");
ni.getInetAddresses();