ns02.gigas.com has no CNAME records.
Question and response
Question
dig ns02.gigas.com. NS
Answer
The response has no answer records.
Authority
gigas.com. 300 SOA ns01.gigas.com. hostmaster.gigas.com. 2026030400 1200 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0