doorman.okmysite.com has no NS records.
NS records for this zone are defined at okmysite.com.
NS records for this zone are defined at okmysite.com.
Question and response
Question
dig doorman.okmysite.com. NS
Answer
The response has no answer records.
Authority
okmysite.com. 3600 SOA dns.okmysite.com. hostmaster.okmysite.com. 1569498086 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0