ionic serve starts on localhost and not the server IP

When running ionic serve I see this:

  Gulp startup tasks: [ 'sass', 'watch' ]
  Running dev server: http://localhost:8100
  Running live reload server: http://localhost:35729
  Watching : [ 'www/**/*', '!www/lib/**/*' ]
  Ionic server commands, enter:
    restart or r to restart the client app from the root
    goto or g and a url to have the app navigate to the given url
    consolelogs or c to enable/disable console log output
    serverlogs or s to enable/disable server log output
    quit or q to shutdown the server and exit

Which means I cannot access the app from a browser as its only listening for localhost. How can I change localhost to the actual server IP?

Thanks