http.planet-work.net has no CNAME records.
Question and response
Question
dig http.planet-work.net. NS
Answer
The response has no answer records.
Authority
planet-work.net. 3447 SOA ns1.planet-work.com. tech.planet-work.com. 2026021903 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0