Just to show how complex this whole area can be, there is some disagreement over the number of times that *ex cathedra * statements have been made. The default position would be twice - regarding the doctrine of papal infallibility itself, and regarding the assumption of Our Lady. Some people make a claim for a few other occasions, but this is dependent on interpretation of the mechanism itself, which can be understood to be not applicable retrospectively, thus limiting its use to the last 100+ years.
As you say, ecumenical councils can also engage magisterial infallibility, but this doesn’t mean that all statements from ecumenical councils are infallibly proclaimed; this is sometimes used as a means to question whether anything promulgated at Vatican II was infallibly proclaimed, but since two dogmatic constitutions were produced by the council, the answer is obviously yes.
Unbroken tradition can also be appealed to as a source of infallible teaching but as an exercise of the ordinary (not extraordinary) magisterium; this also leads to disagreements because there is often a weak understanding of what should be considered as tradition.
The above is summarised in canon law (fairly comprehensibly for non-Catholics) at
vatican.va/archive/ENG1104/__P2H.HTM
What may be of more interest to you is a document prepared by then-Cardinal Ratzinger for the CDF which lists the matters taught infallibly by the Church (he does acknowledge that it may not be exhaustive):
ewtn.com/library/CURIA/CDFADTU.HTM
When you consider that the Church has been around for 2000 years, and produced untold millions of words, it is a surprisingly short list.
And one final point to ponder; although the CDF proclaims matters authoritatively, it does not and cannot proclaim infallibly. So the document is not a conclusive statement, merely an informed opinion.
Hope this helps. Yet another proviso: although you will find plenty of barrack-room canon lawyers here who will have you believe that they are expert in the matter of papal and magisterial infallibility, the truth is that very few people are that sure of their facts; and that includes me, so my statements here are open to challenge.