ftp.ewf.at has no CNAME records.
Question and response
Question
dig ftp.ewf.at. NS
Answer
The response has no answer records.
Authority
ewf.at. 3272 SOA dns1.ewf.at. hostmaster.ewerke.cc. 2016071252 900 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0