Serviio DLNA URL for Airplayer?

I installed serviio on my synology NAS. Problem is that my NAS sits on a different router ip address and my wifi has a different IP address, so it doesn't pick it up automatically. I am trying to add it into my iPad app AirPlayer, which needs a DLNA http URL to the server. I used following URL for my synology diskstation to work.
http://192.168.x.x:50001/desc/device.xml

Is there something similar in serviio? I think it uses port 8859, but what is the full URL for DLNA?