dig.isi.edu has no NS records.
NS records for this zone are defined at isi.edu.
NS records for this zone are defined at isi.edu.
Question and response
Question
dig dig.isi.edu. NS
Answer
The response has no answer records.
Authority
isi.edu. 60 SOA mdrinfoblox-gm01.ads.isi.edu. hostmaster.dev.null. 2022764185 14400 1440 2419200 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0