alan.madduck.net has no CNAME records.
Question and response
Question
dig alan.madduck.net. NS
Answer
The response has no answer records.
Authority
madduck.net. 477 SOA a.ns.madduck.net. hostmaster.madduck.net. 1771380183 16384 2048 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0