core1.tal1.ntfo.org has no CNAME records.
Question and response
Question
dig core1.tal1.ntfo.org. NS
Answer
The response has no answer records.
Authority
tal1.ntfo.org. 5204 SOA ntfo.org. postmaster.ntfo.org. 2025051400 86400 14400 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0