A PTR record or pointer record maps an IPv4 address to the
canonical name for that host. Setting up a PTR record for a
hostname in the in-addr.arpa domain that corresponds to an IP
address implements reverse DNS lookup for that address. For
example www.name.net has the IP address 122.0.3.16, but a PTR
record maps 16.3.0.122.in-addr.arpa.
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DNS Records Explained with Syntax and examples, DNS Records Tutorials Preference numbers, the
client simply attempts all equal Preference servers in random
order, and then goes to MX record with the next highest
Preference number.
PTR Record
<span>A PTR record or pointer record maps an IPv4 address to the
canonical name for that host. Setting up a PTR record for a
hostname in the in-addr.arpa domain that corresponds to an IP
address implements reverse DNS lookup for that address. For
example www.name.net has the IP address 122.0.3.16, but a PTR
record maps 16.3.0.122.in-addr.arpa.
Example of PTR Record with syntax
16.3.0.122.in-addr.arpa. IN PTR name.net
Here as you see the IP Address is reversed and added with in-addr.arpa & Summary
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