mail1.redflush.eu has no NS records.
NS records for this zone are defined at redflush.eu.
NS records for this zone are defined at redflush.eu.
Question and response
Question
dig mail1.redflush.eu. NS
Answer
The response has no answer records.
Authority
redflush.eu. 30 SOA ns1.dnsoperations.net. dns-admin.dnsoperations.net. 2007080106 14400 1800 2592000 28800
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0