By default it will be [Yourname]'s server.
"Blockland Dedicated Server" program included with the game in the Program Files
Someone feel free to correct me, but I'm pretty sure this is just an obsolete old version of dedicated server hosting; there should only be two files in your program files folder - BlocklandLauncher.exe and Uninstall.exe. Anything else is just the ghost of an old version.
When joining your own dedicated server that is in your home network, you will probably need to query LAN to join, rather than query internet.
There are plenty of posts around explaining how to host dedicated servers without that .bat, I won't bother repeating that.