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PTR
Not in your domain's map.
Must be delegated from upstream ISP. Usually isn't and they do it themselves for you.
Administered by IANA and ARIN in the US.
Take the addresses, put them in reverse, add in-addr.arpa and you have your 'reverse ip name'
207.195.212.241 is 241.212.195.207.in-addr.arpa