Same here. It is not surprising as we are on the same network. :D
It usually works like that: I start the game and wait for the list of servers to load. The Disco server has IP of my and JAMs network server, but after refreshing the list the IP is correct and connectable. But now the IP still shows our server and doesnt change after refreshes.
DNS propogation speeds are not something we are directly in control of.
We set the new IP, it gets transmitted within 60 seconds.
BUT if your ISP or your router or your PC or a combination of these has DNS caching enabled, the correct IP won't show up, untill such time the cached DNS entry has expired. That depends on the settings at your ISP, on your Router, or on your PC, or a combination thereoff.
To take the two items that you control yourself out of the loop, you can restart your router, and your PC.
If the ISP you are using is using DNS caching, then you can only wait untill such time the cached entry is invalidated. That can take from 1 hour to 24 hours depending on how your ISP has it configured.