Hello! I’m not sure I understand what you want to do? serve is to serve the site locally while you’re doing edits to it, you want to do that on an IP address different than localhost?
Provided that’s indeed what you want to do for some reason, you would have to look into LiveServer.jl on which franklin relies to serve stuff, LiveServer itself calls HTTP functionalities which can listen to arbitrary IP addresses. So if you open a PR with the possibility to add an IP to the serve of LiveServer I’m happy to review it and integrate it and add the necessary changes to Franklin.
But I must admit I wonder whether that’s really what you want to do 