pmta.ungapped.io has no NS records.
NS records for this zone are defined at ungapped.io.
NS records for this zone are defined at ungapped.io.
Question and response
Question
dig pmta.ungapped.io. NS
Answer
The response has no answer records.
Authority
ungapped.io. 3600 SOA ns1.loopia.se. registry.loopia.se. 1772668800 14400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0