phn.byu.edu has no NS records.
NS records for this zone are defined at byu.edu.
NS records for this zone are defined at byu.edu.
Question and response
Question
dig exercisesciences.ctlbyu.org. NS
Answer
The response has no answer records.
Authority
ctlbyu.org. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1773700553 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0