Hello,
I am not aware of any report/transaction that you could use to get this information "right away".
Using information from the transaction STAD would take "forever", it would not be "practical"...
Performing tracing (ST05 or other) could be an option, but you would still need to go through a lot of information...
You have also to consider the possibility that some RFC destinations could be used sporadically or periodically...
Regards,
Isaías