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https://metrics.torproject.org/rs.html can see which version of Tor a node is running.

How do you remotely determine that?

E.g. with ssh I can simply telnet server 22 and the server will tell me which version of SSH it is running. Can I do something similar with a tor node?

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You can download the relay's server descriptor and read the platform line. You can access this at the http://1.2.3.4/tor/server/authority URL for a given relay's IP address if they have their DirPort enabled on port 80. You can also download a network consensus document and find a relay's platform string in there. The Stem library can make this easier to script, and would also allow you download the status document over a relay/OR connection if the relay doesn't have its DirPort enabled.

If you plan on doing this a lot, you should download these documents from the Tor Metrics website to avoid putting extra strain on the relays.

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