s1.uchicago.edu has no NS records.
NS records for this zone are defined at uchicago.edu.
NS records for this zone are defined at uchicago.edu.
Question and response
Question
dig s1.uchicago.edu. NS
Answer
The response has no answer records.
Authority
uchicago.edu. 900 SOA ucns3.uchicago.edu. domainadmin.uchicago.edu. 14935818 7200 720 2592000 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0