bbns.blackbaud.com has no CNAME records.
Question and response
Question
dig bbns.blackbaud.com. NS
Answer
The response has no answer records.
Authority
blackbaud.com. 2763 SOA ns1.p26.dynect.net. rm-hostmaster.ems.att.com. 1581 3600 600 604800 21600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0