https://medium.com/nlnetlabs/prototyping-unbound-extensions-in-minutes-with-python-and-docker-7fa9be04f79c https://github.com/NLnetLabs/unbound/tree/master/pythonmod/examples
http://www.fit.vutbr.cz/~vasicek/nic-vip/pythonmod/examples/index.html http://www.fit.vutbr.cz/~vasicek/nic-vip/pythonmod/modules/struct.html http://www.fit.vutbr.cz/~vasicek/nic-vip/pythonmod/genindex.html
https://github.com/episource/unbound-modules https://jpmens.net/2011/08/09/extending-unbound-with-python-module/
http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml
https://tools.ietf.org/html/rfc1034 https://tools.ietf.org/html/rfc1035 https://tools.ietf.org/html/rfc1912