_domainkey.slett.net has no NS records.
NS records for this zone are defined at slett.net.
NS records for this zone are defined at slett.net.
Question and response
Question
dig _domainkey.slett.net. NS
Answer
The response has no answer records.
Authority
slett.net. 3600 SOA slett.net. postmaster.slett.net. 2700000069 3600 300 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0