![]() ![]() This is where the Domain Name System comes in. When you use a domain name with any internet-connected program, your local router can’t resolve it (unless it’s cached from a previous request). Global options: As we’ll see, you can use dig to query multiple domains simultaneously.First line: The version of dig and the domain that was queried.flags: qr rd ra QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1 >HEADER DiG 9.11.3-1ubuntu1.11-Ubuntu > So, your router queries either your Internet Service Provider’s (ISP) DNS server, or any other you’ve configured your system to use. ![]() ![]() This line shows the options that have been applied to all of the domain queries. Opcode: Query: This is the type of operation that was requested which, in this case, was a query.In our simple example, it was just the default +cmd (command) option. Status: Noerror: There were no errors and the request was correctly resolved.This value can also be iquery for an inverse query, or status if you’re just testing the state of the DNS system. Flags: qr rd ra: These stand for query, recursion desired, and recursion available.ID: 12017: This random ID ties the request and response together. Recursion is one form of DNS lookup (the other is iterative). ![]()
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