When a DNS server retrieves the host name associated with an IP address what type of look up is it accomplishing?

When a DNS server retrieves the host name associated with an IP address, it is performing a reverse DNS lookup. This process involves querying the DNS database to find the corresponding domain name for a given IP address, typically using a special domain structure that includes the IP address in reverse order. Reverse lookups are often used for various purposes, such as network troubleshooting and security verification.