mta1.therubicongroup.com has no NS records.
NS records for this zone are defined at therubicongroup.com.
NS records for this zone are defined at therubicongroup.com.
Question and response
Question
dig mta1.therubicongroup.com. NS
Answer
The response has no answer records.
Authority
therubicongroup.com. 7200 SOA a2-66.akam.net. hostmaster.therubicongroup.com. 2015111204 10800 600 604800 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0