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Another interesting use of DNS is iodine [0]
>This is a piece of software that lets you tunnel IPv4 data through a DNS server.
[0] https://github.com/yarrick/iodine
Corollary is, spyware can use DNS to exfiltrate data [0]. Or, you could also send out client side metrics with cleverly drafted DNS requests [1]. And, posted here many times on HN, DNS as a cookie replacement [2].
[0] https://unit42.paloaltonetworks.com/dns-tunneling-how-dns-ca...
[1] https://github.com/Jigsaw-Code/choir
[2] http://dnscookie.com/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.