CODEWITHSUNDEEP
javaiplocalhosthostinetaddress
shurik2533
shurik2533

Reputation: 1780

Java. InetAddress.getLocalHost returns strange IP

I'm don't understand, why code below prints 0.0.9.229 instead 127.0.0.1. Can anybody tell me, hot to fix that?

String ha = InetAddress.getLocalHost().getHostAddress();
System.out.println(ha);

UPD: Code running on Ubuntu

/etc/hosts

127.0.0.1       localhost
127.0.1.1       2533

Upvotes: 5

Views: 7719

Answers (3)

shurik2533
shurik2533

Reputation: 1780

The problem is that my hostname will consists only of numbers and could not be resolved. I change my /etc/hostname with characters at first position and problem has solved.

Upvotes: 3

amicngh
amicngh

Reputation: 7899

Use NetworkInterface to enumerate network interfaces; InetAddress.getLocalHost() always returns loopback.If you want to get all IP's associated with your machine use NetworkInterface then you will get 127.0.0.1 also.

 Enumeration<NetworkInterface> nInterfaces = NetworkInterface.getNetworkInterfaces();

    while (nInterfaces.hasMoreElements()) {
        Enumeration<InetAddress> inetAddresses = nInterfaces.nextElement().getInetAddresses();
        while (inetAddresses.hasMoreElements()) {
            String address = inetAddresses.nextElement().getHostAddress();
            System.out.println(address);
        }
    }

Upvotes: 2

No Idea For Name
No Idea For Name

Reputation: 11597

InetAddress.getLocalHost() doesn't do what most people think that it does. It actually returns the hostname of the machine, and the IP address associated with that hostname. This may be the address used to connect to the outside world. It may not. It just depends on how you have your system configured.

On my windowsbox it gets the machine name and the external ip address. On my linux box it returns hostname and 127.0.0.1 because I have it set so in /etc/hosts

Upvotes: 10

Related Questions