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Bind and subdomains

• https://serverfault.com/questions/606291/can-one-server-do-dns-for-a-domain-and-a-subdomain

Unbound

• https://calomel.org/unbound_dns.html

Knot and logging

• https://jpmens.net/2017/09/11/dns-query-response-logging-with-dnstap/

Flush the big DNS systems

• https://developers.google.com/speed/public-dns/cache

• https://1.1.1.1/purge-cache/

• https://cachecheck.opendns.com/

SSHFP

• https://unix.stackexchange.com/questions/121880/how-do-i-generate-sshfp-records