sp1.mkto-ab030046.com has no NS records.
NS records for this zone are defined at mkto-ab030046.com.
NS records for this zone are defined at mkto-ab030046.com.
Question and response
Question
dig sp1.mkto-ab030046.com. NS
Answer
The response has no answer records.
Authority
mkto-ab030046.com. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1774348354 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0