James Cook,
Before DNS was invented in the mid-80s, network admins connected to ARPANET used to share the HOSTS file updated with new entries and their IPs.
You still can use the same idea on your local network in 2021. :)
So create a hosts file with a line such as:
192.168.50.246 rnd.local
Use that same hosts file on all your computers in the local network. Now declare a host in Abyss Web Server with the host name rnd.local and access it using
http://rnd.local .