177-53-181-249.in-addr.arpa has no CNAME records.
Question and response
Question
dig 177-53-181-249.in-addr.arpa. NS
Answer
The response has no answer records.
Authority
in-addr.arpa. 3324 SOA b.in-addr-servers.arpa. nstld.iana.org. 2026021930 1800 900 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0