mail.explora.com.sv has no NS records.
NS records for this zone are defined at explora.com.sv.
NS records for this zone are defined at explora.com.sv.
Question and response
Question
dig mail.explora.com.sv. NS
Answer
The response has no answer records.
Authority
explora.com.sv. 38400 SOA gcasrv.explora.com.sv. bjaime\@explora.com.sv. 2026021100 10801 3600 1209600 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0