PTR
this right for DNS REC 89.71.21.104.in-addr.arpa. IN PTR @ or 89.71.21.104.in-addr.arpa IN PTR @
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if this is a /24, the "domain" you would have in cloudflare already sould be "71.21.104.in-addr.arpa" and you would make a PTR for 89
and point the PTR to whatever name you want rdns to be