spf.winsped.de has no NS records.
NS records for this zone are defined at winsped.de.
NS records for this zone are defined at winsped.de.
Question and response
Question
dig spf.winsped.de. NS
Answer
The response has no answer records.
Authority
winsped.de. 43200 SOA rz-ns-01.winsped.de. administrator.lis.eu. 2012033270 21600 21600 864000 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0