What is the authoritative source for an address lookup?
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The authoritative source for an address lookup is the recursive DNS search, also known as recursive name resolution. Recursive DNS servers work by sending a request to one or more root DNS servers to find the authoritative DNS server for the domain name in question. Once the authoritative server is found, the recursive server queries it for the IP address associated with the domain name.
The operating system cache, browser cache, and ISP local cache can all store previously looked up addresses for faster access in the future. However, they are not authoritative sources for address lookup because they may not have the most up-to-date information or be able to provide information for all domain names.
The operating system cache stores recent DNS lookups for faster access in the future, but this cache is limited to the specific device and may not have the most up-to-date information.
The browser cache stores web page data to improve loading times but it only stores information related to the specific web pages visited and not all domain names.
The ISP local cache stores frequently requested domain names for faster access, but it is not authoritative because it may not have the most up-to-date information and is limited to the specific ISP network.
Therefore, the authoritative source for an address lookup is the recursive DNS search.