Dig Command
Domain Information Groper (dig) command is a powerful command-line tool for querying DNS (Domain Name System) servers to retrieve DNS information. It provides various options to customize queries and obtain detailed DNS data. Here are some commonly used dig command options.
Dig Command Options
- @server: Specifies the DNS server to query. For example:
dig @8.8.8.8 example.comThis queries the DNS server at 8.8.8.8 for the example.com domain.
- +type: Specifies the type of DNS record to query for. For example:
dig +mx example.comThis queries for mail exchange (MX) records for the example.com domain.
- +short: Displays a concise output, useful for scripts or automation. For example:
dig +short A example.comThis retrieves the IPv4 address associated with example.com in a compact format.
- +trace: Enables tracing of the DNS query, showing each step of the resolution process. For example:
dig +trace example.comThis traces the DNS resolution process for the example.com domain.
- +recurse and +norecurse: Specifies whether to perform recursive queries. For example:
dig +recurse example.comThis instructs the DNS server to perform recursive queries for the example.com domain.
- +timeout=X: Sets the query timeout in seconds. For example:
dig +timeout=5 example.comThis sets the query timeout to 5 seconds for the example.com domain.
- +class: Specifies the DNS query class. The default is IN (Internet). For example:
dig +class=CH example.comThis queries for Chaos class DNS records for the example.com domain.
- +all: Displays all information available for a query. For example:
dig +all example.comThis displays all information, including header, question, answer, authority, and additional sections.
- +multiline: Displays output in a multi-line format for easier readability. For example:
dig +multiline example.comThis provides a more detailed output with each section on a separate line.
- +notcp: Forces dig to use UDP instead of TCP for queries. For example:
dig +notcp example.comThis performs the DNS query using UDP instead of TCP.
- +dnssec: Requests DNSSEC (DNS Security Extensions) records in the response. For example:
dig +dnssec example.comThis queries for DNSSEC records associated with the example.com domain.
- +sigchase: Enables signature chasing. This option follows the chain of signatures while attempting to verify DNSSEC signatures. For example:
dig +sigchase example.comThis performs signature chasing for DNSSEC validation of the example.com domain.
- +qr: Shows only the question section of the DNS response. For example:
dig +qr example.comThis displays only the question section of the DNS response for the example.com domain.
- +answer: Shows only the answer section of the DNS response. For example:
dig +answer example.comThis displays only the answer section of the DNS response for the example.com domain.
- +authority: Shows only the authority section of the DNS response. For example:
dig +authority example.comThis displays only the authority section of the DNS response for the example.com domain.
- +additional: Shows only the additional section of the DNS response. For example:
dig +additional example.comThis displays only the additional section of the DNS response for the example.com domain.
- +comments: Shows comments in the output, if any. For example:
dig +comments example.comThis displays comments, if present, in the DNS response for the example.com domain.
- +noquestion: Suppresses the display of the question section in the output. For example:
dig +noquestion example.comThis suppresses the display of the question section in the DNS response for the example.com domain.
- +retry=X: Sets the number of retries in case of a query timeout. For example:
dig +retry=3 example.comThis sets the number of retries to 3 in case of a query timeout for the example.com domain.
- +bufsize=X: Sets the UDP message size to be used for the query. For example:
dig +bufsize=1024 example.comThis sets the UDP message size to 1024 bytes for the example.com domain query.
Summary – dig command
These additional options provide more control and flexibility when querying DNS servers using the dig command. They allow you to customize the output and behavior of the dig command according to your specific requirements. You can explore additional options by referring to the dig manual (man dig).
Useful Links
- https://en.wikipedia.org/wiki/Dig_(command)
- https://en.wikipedia.org/wiki/Dig_(command
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