ns1.zap-hosting.com has no CNAME records.
Question and response
Question
dig ns1.zap-hosting.com. NS
Answer
The response has no answer records.
Authority
zap-hosting.com. 1657 SOA edna.ns.cloudflare.com. dns.cloudflare.com. 2396902141 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0