mail.rth-de.ihost.com has no NS records.
NS records for this zone are defined at ihost.com.
NS records for this zone are defined at ihost.com.
Question and response
Question
dig mail.rth-de.ihost.com. NS
Answer
The response has no answer records.
Authority
ihost.com. 300 SOA dns1.p01.nsone.net. hostmaster.nsone.net. 1726496489 43200 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0