Can the Watson Conversation API define an IP white list?
Can the Watson Conversation API define an IP address white list for both a development environment and a running environment?
The Conversation service does conversations and is isolated from anything that is network related.
If you need to operate white and black lists of IP addresses then you should really be making use of community modules that do that for you. There are several npm and pip modules for Node.js and Python that you can use.
Not sure if it's quite what @ChitoseMine is looking for but I included very basic whitelisting when I was experimenting with an nginx proxy for the Conversation API. If anyone is interested, take a look at the conversation-proxy project on GitHub.