Chapter-19, LEC-5 | Reverse DNS Lookup | #ethicalhacking #cybersecurity #cybersport

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Reverse DNS lookup is a process that involves identifying the domain name associated with a given IP address. This process is the opposite of a standard DNS lookup, which involves identifying the IP address associated with a domain name.

When a user types in a website address, a DNS lookup is performed to translate the domain name into an IP address that can be used to connect to the website's server. However, in some cases, it may be necessary to identify the domain name associated with a given IP address, which is where reverse DNS lookup comes in.

Reverse DNS lookup is typically used for security and troubleshooting purposes. For example, if a network administrator notices suspicious activity on their network, they may use reverse DNS lookup to identify the domain name associated with the suspicious IP address. This can help them identify the source of the activity and take appropriate action to address the issue.

Reverse DNS lookup can also be used for troubleshooting issues with email delivery. Many email providers use reverse DNS lookup to verify that the sending IP address matches the domain name in the email's header. If the IP address does not match the domain name, the email may be marked as spam or rejected altogether.

Overall, reverse DNS lookup is a useful tool for identifying the domain name associated with a given IP address. It can be used for security and troubleshooting purposes, and is a valuable tool for network administrators, cybersecurity professionals, and email providers.