core.tkd.ficolo.net has no NS records.
NS records for this zone are defined at tkd.ficolo.net.
NS records for this zone are defined at tkd.ficolo.net.
Question and response
Question
dig core.tkd.ficolo.net. NS
Answer
The response has no answer records.
Authority
tkd.ficolo.net. 86400 SOA dns1.ficolo.net. hostmaster.ficolo.net. 2015050304 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0