gridmaster.telefonica.com.sv has no NS records.
NS records for this zone are defined at telefonica.com.sv.
NS records for this zone are defined at telefonica.com.sv.
Question and response
Question
dig gridmaster.telefonica.com.sv. NS
Answer
The response has no answer records.
Authority
telefonica.com.sv. 3600 SOA gridmaster.telefonica.com.sv. root.telefonica-ca.net. 2022110466 3600 3600 3600 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0