How are you recording these IPs? It would be very unusual for a 192.168.x.x IP to be able to connect to you since these RFC1918 ranges are not globally routed, and many networks would have packets to and/or from those ranges explicitly firewalled.
In general the only way that a 192.168.x.x IP could connect to your server is if it's within the same network. Another customer at your host playing funny buggers?
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