mail.cdg.ws has no NS records.
NS records for this zone are defined at cdg.ws.
NS records for this zone are defined at cdg.ws.
Question and response
Question
dig mail.cdg.ws. NS
Answer
The response has no answer records.
Authority
cdg.ws. 86400 SOA xbru.br.ns.els-gms.att.net. rm-hostmaster.ems.att.com. 253 86400 10000 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0