c13.starfall.com has no CNAME records.
Question and response
Question
dig c13.starfall.com. NS
Answer
The response has no answer records.
Authority
starfall.com. 1 SOA ns0.pancil.net. sysroot.pancil.net. 2026012602 3600 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0