dns.technorail.com has no CNAME records.
Question and response
Question
dig dns.technorail.com. NS
Answer
The response has no answer records.
Authority
technorail.com. 12 SOA arudns1.aruba.it. hostmaster.technorail.com. 2025112702 86400 7200 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0