Linux and Unix dig Command Examples

The dig command in Linux and Unix is used to query the Domain Name System (DNS) to retrieve information about hostnames, IP addresses, and other DNS-related information. The dig command can be used to perform various types of DNS lookups, such as checking the A (address) record for a hostname, the MX (mail exchange) record for a domain, or the NS (name server) record for a domain.

Here are some examples of how to use the dig command:

1. Perform a basic DNS lookup:

dig example.com

1. Display the A record for a hostname:

dig example.com A

1. Display the MX record for a domain:

dig example.com MX

1. Display the NS record for a domain:

dig example.com NS

1. Display the reverse DNS lookup for an IP address:

dig -x IP_ADDRESS

1. Display the authoritative name servers for a domain:

dig example.com NS +auth

1. Display the additional information for a DNS lookup: