Why is it connecting to an external IP if it is only configured locally?

I have questions about an external connection with Syncthing

netstat -atnp | grep ESTABLISHED:

tcp 0 0 ESTABLISHED 11737/syncthing

tcp 0 0 ESTABLISHED 11737/syncthing

I have Syncthing only in local network, it does not have any settings for internet, nor does it send usage reports.

I see the local address of another device that I am using (which is the first), but an external IP is always shown that sometimes changes (It is the second).

Does anyone know why this second external connection occurs?

Thank you

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