Found this on google hope it helps.

Netflix supports two different HDR streaming formats, Dolby Vision and UltraHD Premium (HDR).
What You’ll Need:
A TV that supports either Dolby Vision or HDR and Netflix. (If you use a set-top box to stream Netflix, both the set-top box and TV must support HDR.) A 4 Screen Netflix plan. You can check which plan you’re currently on at netflix.com/ChangePlan. A steady Internet connection speed of 25 megabits per second or faster. Streaming quality set to “High.” More information about video quality settings can be found in our Playback Settings article.