krypton.4system.sk has no CNAME records.
Question and response
Question
dig krypton.4system.sk. NS
Answer
The response has no answer records.
Authority
4system.sk. 2451 SOA ns1.websupport.sk. admin.websupport.sk. 1771844380 7200 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0