ns2.telefonica.de has no NS records.
NS records for this zone are defined at telefonica.de.
NS records for this zone are defined at telefonica.de.
Question and response
Question
dig ns2.telefonica.de. NS
Answer
The response has no answer records.
Authority
telefonica.de. 600 SOA ns1.telefonica.de. hostmaster\.de.telefonica.com. 2065 28800 7200 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0