srv.pc021hosting.com has no CNAME records.
Question and response
Question
dig srv.pc021hosting.com. NS
Answer
The response has no answer records.
Authority
pc021hosting.com. 788 SOA dave.ns.cloudflare.com. dns.cloudflare.com. 2393950090 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0