You may want to take a look at the beta version that has added UDP multicasting support.
From the release notes:
- UDP Multicast: JTAlert now supports joining a UDP multicast group IP address
when interacting with WSJT-X. This is automatic, using the settings as defined
for each detected WSJT-X instance discovered running on the same PC as JTAlert.
Multicast support across multiple PCs/Networks is not supported.
Current JTAlert/WSJT-X setups, either single or multiple instance will operate
as normal without any changes to WSJT-X settings.
Users who want to take advantage of concurrently running applications like DX
Aggregator or Grid Tracker along-side JTAlert will need to set the WSJT-X UDP
Server to a valid Multicast IP (in the 18.104.22.168 to 22.214.171.124 range) and set
those applications to use that IP address. JTAlert requires zero-configuration.