artemis.ttd.net has no CNAME records.
Question and response
Question
dig artemis.ttd.net. NS
Answer
The response has no answer records.
Authority
ttd.net. 5701 SOA minerva.ttd.net. hostmaster.ttd.net. 2017011786 86400 7200 2592000 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0