The other two answers are excellent. 4.2.2.2 is not so much a server as a IP address of a DNS server. as has been said, it belongs to Level 3, and is part of the block of IP addresses that belongs to Level 3. It was registered Dec 1, 1992, so it is a very old address / server.
DNS Server List, Fastest IPv4 IPv6 DNS Address ⋆ BEST Oct 05, 2018 wiki.ipfire.org - List of Public DNS Servers A DNS server has a very powerful function in network topology. Please keep in mind that it might log your queries (which is a huge information leak). Further, not all of the DNS servers listed above return correct answers in any case. 10 Best DNS Servers Free & Public (No. 4 is Very Useful) Dec 29, 2017 What is a 4.2.2.2 DNS? - Quora
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DNS not resolving some addresses?