MO posts currently in the HNQ: Number of positions of Rubik's cube grows with multiplier 13 with the distance - what are explanations and groups with similar growth pattern?, Determinantal symmetry: proof requested and Why not a Stacks project for Homotopy Theory?

What mathoverflow.* sites/domains exist? I am asking this after seeing the question: Has word “mathoverflow” trademark?

I see that mathoverflow.com redirects to MO.

The domain mathoverflow.in is mentioned in the question. I see that mathoverflow.biz also exists.

Is there some tool to find such domains which somebody owns and domains which are unused?

So MathOverflow now reached 100000 questions.

The question which is currently No. 100000 based on the API is Concerning the Dixmier and the Jacobian Conjectures.

However, the screenshots I have are only with one less and one more:

I will add links to discussions about some milestones on other sites: What was the 10 millionth question? (Meta Stack Overflow), Identify our millionth question (Meta Mathematics)

As you can see there, the question No. 100k can be identified using API: api.stackexchange.com/2.2/… and there are also various SEDE queries. All of them will work only with questions that remained on the site - so the exact question with this number can change over time.

In any case, congrats to MathOverflow on reaching 100k questions. Probably it is a milestone worth recording in History of MathOverflow.

It seems that some questions have been deleted in the meantime, since this is what I am getting now:

And now I see Asaf Karagila's question as the number 10000: