The Domain Name System (DNS) is a hierarchical naming system for computers, services, or any resource connected to the Internet or a private network.
There are 2 types of DNS lookup they are:
Forward DNS Lookup:
Forward DNS Lookup tries to resolve a hostname to an IP address.eg.gethostbyname().
Reverse DNS Lookup:
Reverse DNS Lookup tries to resolve a IP address to an hostname.eg.gethostbyaddr()
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