sm136115.domain2020.com has no NS records.
NS records for this zone are defined at domain2020.com.
NS records for this zone are defined at domain2020.com.
Question and response
Question
dig sm136115.domain2020.com. NS
Answer
The response has no answer records.
Authority
domain2020.com. 3600 SOA ns1.wpdns.com. . 272 3600 600 86400 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0