_spf.wwi.dk has no NS records.
NS records for this zone are defined at wwi.dk.
NS records for this zone are defined at wwi.dk.
Question and response
Question
dig _spf.wwi.dk. NS
Answer
The response has no answer records.
Authority
wwi.dk. 180 SOA ns10.dnsmadeeasy.com. dns.dnsmadeeasy.com. 2009012604 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0