f.tld.lt has no CNAME records.
Question and response
Question
dig f.tld.lt. NS
Answer
The response has no answer records.
Authority
lt. 900 SOA a.tld.lt. hostmaster.domreg.lt. 1772028014 3600 300 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0