dns.gbooker.net has no NS records.
NS records for this zone are defined at gbooker.net.
NS records for this zone are defined at gbooker.net.
Question and response
Question
dig dns.gbooker.net. NS
Answer
The response has no answer records.
Authority
gbooker.net. 300 SOA ns1109.ui-dns.org. hostmaster.1and1.com. 2016072603 28800 7200 604800 300
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0