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Returns the PTR record used by reverse DNS.
reverse_pointer(x)
A character vector
An ip_address vector
ip_address
These documents describe reverse DNS lookup in more detail:
IPv4: RFC-1035 Section 3.5
IPv6: RFC-3596 Section 2.5
reverse_pointer(ip_address("127.0.0.1")) reverse_pointer(ip_address("2001:db8::1"))
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