[steve19]

I am not sure how Wikipedia can be more explicit, they even have a table showing the voltages and wattages of the different standards. [0]

According to that table, the latest standard, 802.3bt Type 4, can provide 71 W to the device at the end of the cable (and inject 100W into the otherside).

[0] https://en.wikipedia.org/wiki/Power_over_Ethernet

[mark-r]

Clicking on the link "Power capacity limits" brings you to nothing useful. Are you looking elsewhere?

[steve19]

Scroll down to the table "Comparison of PoE parameters".