Although this question might seem outright lazy at first glance, it is actually quite bothersome (e.g. the Iphone X's notch height being included in viewport calculation - information that is not mentioned anywhere else).
After fumbling around for a whole week and getting conflicting information from different websites, I decided just to go to the apple store and take a bunch of pictures of the website http://viewportsizes.com/mine/
I hope these rudimentary photos will help any future developers who are struggling with supporting different screen sizes.
Additional browser (not screen) viewports:
Iphone XS (same as iphone X): 375 x 635
Iphone XS Max: 414 x 719
Iphone 4: 320 x 372