yellow.soltec.net has no NS records.
NS records for this zone are defined at soltec.net.
NS records for this zone are defined at soltec.net.
Question and response
Question
dig yellow.soltec.net. NS
Answer
The response has no answer records.
Authority
soltec.net. 3600 SOA blue.soltec.net. hostmaster.blue.soltec.net. 1651672442 3600 600 86400 14400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0