If i understand your question right then the lower half subnet is from 192.168.3.1 to 192.168.3.126 (0 and 127 are omitted as the subnet ID and the subnet broadcast address), or in another format 192.168.3.0/25.
Or if you do want to plan subnetting like Mohammed suggested, then it all depends as to how big of a network you need. If you want point to point link with just two addresses, then you can use 30 bit mask, like so: 192.168.3.0/30
Where 192.168.3.0 is network, 192.168.3.1 and 192.168.3.2 are usable addresses and 192.168.3.3 is broadcast.
We are pleased to announce availability of Beta software for 16.6.3.
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