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Forward lookup zone is use to resolve domain name into IP address.
Forward lookup zones support the primary function of Domain Name System (DNS), that is, the resolution of host names to IP addresses
If your question isThe Domain Name System (DNS)? it is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities.
It used external ISP IP address to find local IP address