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Looking up SPF, DKIM and DMARC records in DNS
Looking up SPF, DKIM and DMARC records in DNS

How to look up SPF, DKIM and DMARC records using the command line and terminal.

Ivan Kovachev avatar
Written by Ivan Kovachev
Updated over a week ago

DMARC records (that are published in a domain's DNS) are essential for email security. They prevent email spoofing by specifying how to handle emails failing SPF or DKIM checks. These TXT records define actions for unauthenticated emails and provide feedback on their domain's email authenticity, thereby reducing phishing risks and enhancing email deliverability.

The table below shows the commands used in Windows Command Line and Mac OS Terminal to query for the SPF, DKIM and DMARC records for a particular domain.

Follow the instructions below and substitute the words selector and domain with the corresponding DKIM selector and domain you would like to look up.

Record |    Windows Command Line    |         Mac OS Terminal
SPF    |nslookup  -type=txt domain  |dig txt domain
DKIM   |>nslookup                   |dig txt selector._domainkey.domain
       |>set q=txt                  |
       |>selector._domainkey.domain |
DMARC  |nslookup -type=txt          |dig txt _dmarc.domain
       | _dmarc.domain              |

Check your DMARC, DKIM & SPF

While querying can give some information on SPF, DKIM and DMARC you can check your own configuration in detail with OnDMARC's free tool Investigate.

Example 1. Querying the SPF record for using nslookup.

nslookup -type=txt 

Example 2. Querying the DKIM key for using dig. You will have to know the DKIM selector - "google" in our case - being used in order to query for the DKIM key.

dig txt 

Example 3. Querying the DMARC record for using nslookup.

nslookup - type=txt

Analyze a domain’s security in 1 click 

OnDMARC’s Analyzer tool will reveal the status of SPF, DKIM and DMARC for any domain in 1 click. A handy feature to investigate how secure your supply chain is and if they’re vulnerable to email impersonation.

Try it out for free by starting a 14-day free trial with OnDMARC today.

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