dns.rotofiles.com has no NS records.
NS records for this zone are defined at rotofiles.com.
NS records for this zone are defined at rotofiles.com.
Question and response
Question
dig dns.rotofiles.com. NS
Answer
The response has no answer records.
Authority
rotofiles.com. 3600 SOA dns.rotofiles.com. hostmaster.rotofiles.com. 1244793483 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0