Where does each item level and affix drop?

Question

I understand that item level determines where an item can drop (act/difficulty) and what affixes it can have, but I am having trouble finding information that clearly states the following:

1. The earliest act/difficulty where you can find each item level, and

2. The item levels for each range of each affix.

For the former, I have only found information about ilvl 60 - 63 but I would like information for all item levels. For the latter I have only found this page linked on another question, but it's not clear where each "tier" of affix can drop.

Answer 1

For your first question (item/monster levels), I came across a chart someone made to illustrate experience gain, but which can be applied to this as well.

Chart

Source thread on reddit by "Malloy626"

Basically, the cells marked as 100% will be the min, mid and max monster levels in each Act. I doubt all the data is entirely correct, but it gives a good indication on what maximum item levels to expect.

Answer 2

I managed this find this, which is laid out sorta weird, but if you click on any particular affix it will tell you the "affix level," and I think it corresponds to item level; e.g. something that is affix level 43 is only on ilvl 43 and above. I don't have confirmation of that, though.