IncludeIP is used to identify computers that have IP addresses that are not known by your database vendors and thus do need to be proxied. It accepts a single parameter that is either an IP address or an IP address range.
The top of the config.txt/ezproxy.cfg file can be considered to start with an implicit
The most frequent use of IncludeIP is to identify local computers that should be treated as remote computers for testing. The next most frequent use is to reverse all prior AutoLoginIP and ExcludeIP directives.
In this example, all machines in the IP address range of 192.168.0.0-192.168.255.255 are known to the vendor and can bypass EZproxy, but 192.168.12.1 requires the user to log in for testing purposes.