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DNS or Domain Name Service resolves hostnames to IP addresses. Most enterprises have a local DNS to resolve hostnames managed by them, and then a public Internet DNS resolves external hostnames.
Troubleshooting DNS is performed with the utilities, nslookup or dig. Both provide similar information; however, dig is more detailed. In this section, the usage of dig is explored.
The dig command displays results in the following sections:
The dig command supports an array of options. The most common options include a reverse look-up using dig –x [IP address] to find a host name. The other is to specify a DNS server to query using dig @[dns server] [hostname].
For the complete list of dig options, see the FreeBSD manual page.