123.pool62-37-206.dynamic.orange.es has no CNAME records.
Question and response
Question
dig 123.pool62-37-206.dynamic.orange.es. NS
Answer
The response has no answer records.
Authority
pool62-37-206.dynamic.orange.es. 10291 SOA dnsa01m-men4.net.orange.es. dnsmaster.es.orange-ftgroup.com. 2006061906 86400 7200 2592000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0