stlukas.yi.org has no CNAME records.
Question and response
Question
dig stlukas.yi.org. NS
Answer
The response has no answer records.
Authority
yi.org. 127 SOA connubialis.crackerjack.net. wh.yi.org. 1 28800 3600 28800 100
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0