https://learn.microsoft.com/en-us/sql/relational-databases/system-catalog-views/data-tier-application-views-dbo-sysdac-instances?view=sql-server-ver17
dbo.sysdac_instances (Transact-SQL) - SQL Server | Microsoft Learn
Displays one row for each data-tier application (DAC) instance deployed to an instance of the Database Engine.
sql serverdboinstancestransactmicrosoft