billing.yu.net has no NS records.
NS records for this zone are defined at yu.net.
NS records for this zone are defined at yu.net.
Question and response
Question
dig billing.yu.net. NS
Answer
The response has no answer records.
Authority
yu.net. 1800 SOA ns1.yu.net. hostmaster.yu.net. 2025122402 300 300 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0