The domain root can only be an A record. Links https://www.howtoforge.com/troubleshooting-common-dns-misconfiguration-errors https://www.madboa.com/geek/dig/ http://tldp.org/HOWTO/DNS-HOWTO-5.html https://www.ateamsystems.com/tech-blog/using-dig-to-find-domain-dns-ttl/
