The IP address of the attacker is 10.10.1.16. This can be verified by analyzing the Windows.events.evtx file using a tool such as Event Viewer or Log Parser. The file contains several Audit Failure logs with event ID 4625, which indicate failed logon attempts to the system.
The logs show that the source network address of the failed logon attempts is 10.10.1.16, which is the IP address of the attacker.