Take a look at your server information page by opening this URL:
This will require credentials using the username and password defined in [install-dir]/conf/admin.password.
One you load the page, look under <ApplicationInstance>/<Client> where you can find real-time information like this:
You can see that a Wirecast encoder is connect and from what IP address, etc. There is other relevant information listed here as well.
<FlashVersion>Wirecast/FM 1.0 (compatible; FMSc/1.0)</FlashVersion>