These IPs are from users on other private networks, obviously not there real external IP, they are usually firewalled.
But you could still be able to connect to them via PUSH if you are not firewalled too.
If you are firewalled and cant accept incomming connections and you dont like to try to connect to private IPs check the 'Host is behind firewalled' switch.
Also you can uncheck the 'Connected to LAN' switch if its not necessary for you to download/upload from machines on your private network.

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