mailserver1.viaginterkom.de has no NS records.
NS records for this zone are defined at viaginterkom.de.
NS records for this zone are defined at viaginterkom.de.
Question and response
Question
dig mailserver1.viaginterkom.de. NS
Answer
The response has no answer records.
Authority
viaginterkom.de. 86400 SOA ns1.o2online.de. hostmaster.o2online.de. 2026010200 14400 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0