Since I read from left to right its major:minor to me. The major one is the IP, since it can have 65535 ports. Its unfortunately not the same with dates. I pref

Since I read from left to right its major:minor to me. The major one is the IP, since it can have 65535 ports. Its unfortunately not the same with dates. I prefer ISO 8601. Major:minor:micro (or whatever you call it with 3).