rs.vpnunlimited.com has no NS records.
NS records for this zone are defined at vpnunlimited.com.
NS records for this zone are defined at vpnunlimited.com.
Question and response
Question
dig rs.vpnunlimited.com. NS
Answer
The response has no answer records.
Authority
vpnunlimited.com. 1800 SOA hope.ns.cloudflare.com. dns.cloudflare.com. 2399304782 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0