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1. Simple dig Command Usage (Understand dig Output) When you pass a domain name to the dig command, by default it displays the A record (the ip-address of the site that is queried) as shown below. In this example, it displays the A record of redhat.com in the “ANSWER SECTION” of the dig command output.
The ADDITIONAL SECTION contains data that you did not explicitly ask for, but the server gave it to you anyway. This can be used by servers to give answers to typical follow-up questions, because lookup patterns can be quite predictable.
The dig command in Linux is used to gather DNS information. It stands for Domain Information Groper, and it collects data about Domain Name Servers. The dig command is helpful for troubleshooting DNS problems, but is also used to display DNS information.
The Authority section indicates the server(s) that are the ultimate authority for answering DNS queries about that domain.
The reason for this section is that you can query any* DNS server(s) to answer a query for you. That server may choose though to answer the query from a cache. However, if you want to ensure you get an authoritative response ("from the horses mouth" so to speak) - you should ask the server(s) in the authority section.
(* = Any server which will accept your query, that is.)
Those are cached records coming from the old servers. Cloudflare has 1-day TTLs on the NS records, so that indicates that your resolver cached them about 18 hours ago, and they should go away in 6 hours.
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