How to find Provider URL for websphere

Hi Experts,

I am wrinting a standalone jms program to talk to websphere default messaging provider,
In the below code

 tbl.put("java.naming.factory.initial", "com.ibm.websphere.naming.WsnInitialContextFactory");
        tbl.put("java.naming.provider.url", namingURL);
        Context ctx = new InitialContext(tbl);
        System.out.println(" Initial Context Created ");
        myConnFactory = (QueueConnectionFactory)ctx.lookup(connectionFactoryName);

I am confused about namingURL, can you please help me on how to get namingURL for my websphere server.

thanks