osh-dns2.minacs.com has no CNAME records.
Question and response
Question
dig osh-dns2.minacs.com. NS
Answer
The response has no answer records.
Authority
minacs.com. 413 SOA fh-dns1.minacs.com. hostmaster.minacs.com. 729 900 600 86400 1200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0