connections to 192.168.100.223

[YZgitter]

After updating to 5.1.0, I was alerted by my firewall that qBittorrent is trying to connect to 192.168.100.223 (ports 6881 and 12030).
Why is that?
I checked the logs and the older qB version didn't do that, at least not recently.

The weird thing is that my router doesn't assign 192.168.100.* IPs, it uses a different LAN range. So what is qB doing?