pendragon.cs.purdue.edu has no CNAME records.
Question and response
Question
dig pendragon.cs.purdue.edu. NS
Answer
The response has no answer records.
Authority
cs.purdue.edu. 2047 SOA pendragon.cs.purdue.edu. postmaster.cs.purdue.edu. 2026030513 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0