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Reverse DNS smaller than /24 (v4)

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Hey everyone, i only have a /29 range assinged to me with cname pointing to my server for ptr, i tried adding the range to reverse zone in my server, but does not update. 

when i dig my addy i get this response

if i dig -x 185.169.164.171 @ -my server- it works fine.

171.164.169.185.in-addr.arpa. 7200 IN   CNAME   171.168/29.164.169.185.in-addr.a

how do i add only the /29 to the settings apposed to the entire /24

 

so that i can match the CNAMEs to the isp set onces 

 


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