fra.pay1.de has no NS records.
NS records for this zone are defined at pay1.de.
NS records for this zone are defined at pay1.de.
Question and response
Question
dig fra.pay1.de. NS
Answer
The response has no answer records.
Authority
pay1.de. 3600 SOA edns1.ultradns.com. hostmaster.payone.com. 2272967942 28800 7200 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0