Usage of dig command
Introduction
The dig command is a popular tool for querying DNS (Domain Name System) servers to obtain information related to domain names. It is a powerful command-line tool used to perform various DNS queries. It is available on most Unix-based systems and can be used to troubleshoot and diagnose DNS-related issues. In this article, we will explore some common usage of the dig command.
Usage
install dig
apt install dnsutils
## or
yum install bind-utils
simple query
dig example.com
query with specific type
## query type is one of (a,any,mx,ns,soa,hinfo,axfr,txt,...) [default:a]
dig txt example.com
shorten the result
dig +short example.com
verbose the process
dig +trace example.com
specify DNS server
dig @114.114.114.114 example.com
Conclusion
The dig command is a powerful tool for querying DNS servers and retrieving information related to domain names. It can be used to troubleshoot and diagnose DNS-related issues, as well as to compare the response of different DNS servers. By mastering the common usage of the dig command, you can become a more efficient and effective system administrator.
reference
https://aws.amazon.com/route53/what-is-dns/https://www.cloudflare.com/learning/dns/what-is-dns/https://www.verisign.com/en_US/website-presence/online/how-dns-works/index.xhtml