mx5.mobily.com.sa has no NS records.
NS records for this zone are defined at mobily.com.sa.
NS records for this zone are defined at mobily.com.sa.
Question and response
Question
dig mx5.mobily.com.sa. NS
Answer
The response has no answer records.
Authority
mobily.com.sa. 900 SOA gm-mlg-01.prod.mobily.lan. hostmaster.mobily.com.sa. 44608 10800 1080 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0