der.skatool.com has no CNAME records.
Question and response
Question
dig der.skatool.com. NS
Answer
The response has no answer records.
Authority
skatool.com. 10536 SOA ns1.dyna-ns.net. hostmaster.skatool.com. 2026030601 16384 2048 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0