My Linux system is doing a lot of DNS queries to 220.127.116.11.in-addr.arpa but I don't know of any reason it should be doing this. What is at in-addr.arpa?
Any reason why these queries are occurring?
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This is a totally normal
PTR lookup for the IPv4 address 18.104.22.168 (which is the reverse of how it appears in your logs).
Its purpose is to resolve the IP into a name, if a
PTR record was registered. This is the inverse of the usual name lookup which looks up a name in order to retrieve the IP address.