@sokonomi so your running sonarr - pretty sure you can change that default 8989 port. Are you running it as docker, you can also set the docker port to be something different and leave sonarr as 8989.
As to accessing via just sonarr via some url link, you can set your box to use a search suffix so that just using host would auto do a dns query for whatever your search suffixes are, ie sonarr.yourdomain.tld
I never get why this is of concern to so many - so what if the url is http://something.domaint.tld:port - once you create the bookmark, what does it matter just click the bookmark.
Unless you were wanting to hand this off to users, and you feel the users are too stupid to understand putting the :port on the end of the url, or you concerned that port would not be available outbound from where they are at, etc.
But if you provide more details of what your trying to accomplish we can go over all the different ways to skin that specific cat.
but anything via just host name is going to be bad practice - you should always use fqdn when accessing resources.
