dns.surfnavi.com has no NS records.
NS records for this zone are defined at surfnavi.com.
NS records for this zone are defined at surfnavi.com.
Question and response
Question
dig dns.surfnavi.com. NS
Answer
The response has no answer records.
Authority
surfnavi.com. 3600 SOA dns.surfnavi.com. hostmaster.surfnavi.com. 1407980572 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0