perl.mx.develooper.com has no NS records.
NS records for this zone are defined at develooper.com.
NS records for this zone are defined at develooper.com.
Question and response
Question
dig perl.mx.develooper.com. NS
Answer
The response has no answer records.
Authority
develooper.com. 360 SOA ns.develooper.com. dnsoper.bitnames.com. 2026022826 600 600 4838400 360
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0