It is from a user point of view, I am not going to talk about things like DNS Zone Transfer (AXFR), DNS NOTIFY or DNS UPDATE. It is popular due to its flexibility, simple to use, and crystal clear output over host command.The Linux and Unix dig command fundamentally used for the following purposes: https://www.hostinger.com/tutorials/how-to-use-the-dig-command-in-linux (dig manual page) I would like to show in this post, how DNS and DNSSEC basically works, using dig. To find out the server listed as primary (the notion of "primary" is quite fuzzy these days and typically has no good answer): % dig +short SOA stackoverflow.com | cut -d' ' -f1 ns51.domaincontrol.com. The following example uses ns1.redhat.com as the DNS server to get the answer (instead of using the DNS servers from the /etc/resolv.conf file). If you like to use a different DNS server to perform the query, specify it in the command line as @dnsserver. ns51.domaincontrol.com. If you are still unsure of whether your Raspberry Pi is using your newly set DNS servers, you can utilize the dig tool. For example, the following dig command performs a DNS lookup on the example.com domain using an OpenDNS server (which has IP address 208.67.222.222): dig @ 208.67.222.222 example.com; By default, dig displays the A record for a domain. Query DNS MX record with Dig. By default dig uses the DNS servers defined in your /etc/resolv.conf file. The dig command is primarily used to query DNS servers. You can use dig to query any DNS server you specify (or use the default nameservers) and get all DNS records from that server. Clicking on a hostname in the output will add it to the hostnames list. You can either specify a number of the type (if you're brave) or one of the following strings: a, aaaa, a6, soa, cname, hinfo, mx, ns, txt and ptr. dig is a DNS lookup utility, and a flexible tool for interrogating DNS name servers. To find out the name servers of a domain on Unix: % dig +short NS stackoverflow.com ns52.domaincontrol.com. 4. Clicking on a nameserver will add it to the "Specify myself" list. Use Dig to query DNS PTR record. Get DNS records Against a specific DNS server Check DNS A record with Dig. We can install the package by running the following command within the terminal on the Raspberry Pi. It is a useful tool for network troubleshooting. dig (domain information groper) is a flexible tool for interrogating DNS name servers. Sometimes it may be necessary to get DNS records from a DNS server even if the domain is already pointed at a different DNS server. It performs DNS lookups and displays the answers that are returned from the name server(s) that were queried.Most DNS administrators use dig to troubleshoot DNS problems because of its flexibility, ease of use and clarity of output. sudo apt-get install dnsutils. How to use Dig command. -r retries Number of retries for DNS requests, default 3. Before we can utilize the “dig” tool, we must first install the dnsutils package. -s server DNS server to use for the initial request, default is aquired from the system. -q queryclass Change the query-class, default is A. Other lookup tools tend to have less functionality than dig. If you select "Show IP geolocation", you will see a flag next to IP addresses. https://www.howtogeek.com/663056/how-to-use-the-dig-command-on-linux One tool you can use under linux is called dig. Hovering over an IP address will display the geolocation (data from lite.ip2location.com). 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