redirect01.theory7.net has no NS records.
NS records for this zone are defined at theory7.net.
NS records for this zone are defined at theory7.net.
Question and response
Question
dig redirect01.theory7.net. NS
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0