mail1.olgdns.eu has no NS records.
NS records for this zone are defined at olgdns.eu.
NS records for this zone are defined at olgdns.eu.
Question and response
Question
dig mail1.olgdns.eu. NS
Answer
The response has no answer records.
Authority
olgdns.eu. 300 SOA ns1.lexsynergy.net. dnsmaster.lexsynergy.com. 36 604800 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0