Facebook as IP checker?

I just found that if you go to this link

Facebook will tell your IP address, like this:


window._ip_version = {"address":"XXX.XXX.XXX.XXX","version":4,"variant":null};
(X = [0-9])

As far as I know, the "address" is your IP address, and the "version" means IPv4.
I don't know what the 2 numbers on the top means either.

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