ns2.smz88.com has no NS records.
NS records for this zone are defined at smz88.com.
NS records for this zone are defined at smz88.com.
Question and response
Question
dig ns2.smz88.com. NS
Answer
The response has no answer records.
Authority
smz88.com. 600 SOA ns1.smz88.com. hostmaster.smz88.com. 2603132246 300 300 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0