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Why is that disturbing? For me, the name doesn't resolve (http://pn/).

Assuming you are using your parents' ISP's default DNS servers, isn't it a safe, though less-than-desirable, result for the ISP to forward you to a search page when resolution fails?

No, the DNS should return NXDOMAIN and that’s it.

Using a different DNS server not provided by the ISP would most likely solve the problem.

You can do so in either the router or your computer/phone. Two well known and performant public DNS servers are found at 1.1.1.1 (CloudFlare) and 8.8.8.8 (Google).

Time to change ISP's or check for malware :/