I've noticed quite a bit of queries to our DNS servers, that look
pretty normal except for the fact that the character case is weird..
seems to be switching case randomly!

like:

nAme1.dOMain.Com
naMe2.DOMain.coM
...

and so on..

I am wondering if this my DNS server logging issue, or some bug or
attack/scan technique out there.

Thanks,
Mohamed.
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