How can I check to see if a given Onion Service is still in-use?
To be clear: I'm not asking about just Onion Services bound to port 80. Of course I can just curl it, but that won't tell me if the Onion Service is running something on another port.
I'm trying to find an XMPP server that uses an Onion Service. I found several lists of XMPP servers and their .onion names, but I expect most of these services are offline.
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I don't want to eliminate them just for not running an HTTP server (eg port 80, 443, 8080, etc). Nor do I want to eliminate them for not running on a common XMPP port (5222, 5223, 5269, 5298, 8010). I'm trying to find something that checks if an Onion Service has been used in the past days/weeks without requiring me to test a connection on a given port.
My understanding is that Onion Services will (by default) generate and publish hidden service descriptors (HSDir).
Is there some way I can query the Tor directory of HSDirs to see if a given Onion Service is still active?