ran.retn.net has no CNAME records.
Question and response
Question
dig ran.retn.net. NS
Answer
The response has no answer records.
Authority
retn.net. 10800 SOA nsa.retn.net. noc.retn.net. 2026030200 7200 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0