ns4.gransy.com has no CNAME records.
Question and response
Question
dig ns4.gransy.com. NS
Answer
The response has no answer records.
Authority
gransy.com. 38 SOA ns1.anycastdns.cz. root.gransy.com. 2772112861 86400 900 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0