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A CNAME record or Canonical Name record matches up a domain (or subdomain) to a different domain. With a CNAME record, DNS lookups use the target domain’s DNS resolution as the alias’s resolution
A PTR record or pointer record matches up an IP address to a domain (or subdomain), allowing reverse DNS queries to function. It performs the opposite service an A record does, in that it allows you to look up the domain associated with a particular IP address, instead of vice versa.
CNAME is a canoonical name record is provide to user fully domain name.Within DNS, an IP Address can be stored against a PTR record. You can use NSLOOKUP to resolve both hostnames and IP addresses, though use of NSLOOKUP has been deprecated for quite some time.
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