mxout01do.versatel.de has no NS records.
NS records for this zone are defined at versatel.de.
NS records for this zone are defined at versatel.de.
Question and response
Question
dig mxout01do.versatel.de. NS
Answer
The response has no answer records.
Authority
versatel.de. 86400 SOA dnsdb.versatel.de. hostmaster.versatel.de. 2026010700 10000 3000 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0