Yep, the ASN 5617 shared by the OP in their original message is Orange Polska, which for the benefit of IBJoel is a common ISP in Poland. It would be a bit like blacklisting AT&T in the US, as I understand it Orange Polska they are the effective inheritor of the former monopoly telecoms operator in Poland.

Whilst either IB or Cloudflare have obviously seen some nefarious activity from the Orange Polska network this one might require a review.