ws.movistararg.com has no NS records.
NS records for this zone are defined at movistararg.com.
NS records for this zone are defined at movistararg.com.
Question and response
Question
dig ws.movistararg.com. NS
Answer
The response has no answer records.
Authority
movistararg.com. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1772192611 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0