Analog of nslookup's ls command in java program

Question

What technology can be used to implement analog of nslookup's ls command in a java program?

For example, it would receive 'com' as a parameter and return a list of strings with all domain names under '.com'.

Windows implementation of ls command: https://technet.microsoft.com/en-us/library/bb490725.aspx

Unix implementation seems to have all but disappeared, even though it worked fine a few years back.

Answer 1

Apache Commons Net has a 'whois' client for Java. Example usage here.