dns4.pltpro.com has no NS records.
NS records for this zone are defined at pltpro.com.
NS records for this zone are defined at pltpro.com.
Question and response
Question
dig dns4.pltpro.com. NS
Answer
The response has no answer records.
Authority
pltpro.com. 3600 SOA ns4.pltpro.com. support_my\@pltpro.com.pltpro.com. 2019051478 1200 600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0