Dig

About the Dig tool

Computers use the Domain Name System (or DNS for short) to convert human-readable domain names (e.g. www.soliddevtools.com) into an IPv4 address (e.g. 109.228.50.239) or an IPv6 address (e.g. 2a00:da00:1800:15a::1).

DNS records also store information about the millions of domains and websites that are on the Internet - such as an approved list of servers that can send mail on your domain's behalf (known as SPF records.)

"Dig" is a tool on Unix and Linux servers that queries the Domain Name System for these records.