Marinetraffic is a good example of enshittification. Started well, now it's heavy and ad-laden, practically useless without a paid account.
I find Marinetraffic is fine without an account.
Here is a link to oil tankers anchored around the Strait of Hormuz. It has much better filters:
https://www.marinetraffic.com/en/ais/home/centerx:56.8/cente...
Sounds like Flightradar24