arel.idxserver.com has no NS records.
NS records for this zone are defined at idxserver.com.
NS records for this zone are defined at idxserver.com.
Question and response
Question
dig arel.idxserver.com. NS
Answer
The response has no answer records.
Authority
idxserver.com. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1772450407 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0