f.tld.ma has no CNAME records.
Question and response
Question
dig f.tld.ma. NS
Answer
The response has no answer records.
Authority
tld.ma. 900 SOA a.tld.ma. ma.anrt.ma. 47 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0