What is the purpose of creating PTR records in DNS?

Creating PTR records in DNS serves the purpose of mapping IP addresses to hostnames, which is essential for reverse DNS lookups. This process allows systems to resolve an IP address back to its corresponding domain name, facilitating numerous applications such as logging, troubleshooting, and ensuring greater accuracy in identifying the source of traffic.

For example, when a server receives a request from an IP address, it can perform a reverse lookup using the PTR record to determine the hostname associated with that IP. This is particularly useful in email servers for spam filtering, where checking the legitimacy of the sending server's domain name can help in authenticating the sender.

Other options are not aligned with the function of PTR records. They involve different aspects of DNS or network functionality that do not pertain to the primary purpose of reverse mapping IP addresses to hostnames.