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Is there a method to find a domain's DKIM and DMARC records using dig or nslookup?

I have attempted to do the following:

dig somedomain.org any

returns many records, but not the known DKIM and DMARC text records.

nslookup -type=txt somedomain.org

returns all the text records known except the DKIM and DMARC records.

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DKIM records are applied to arbitrary subdomains (Google Apps uses google._domainkey.example.com) that you'd have to know/guess to look for. –  ceejayoz Aug 29 '14 at 15:38
    
It depends on the selector prefix used, part of the DKIM header in a signed email –  Mathias R. Jessen Aug 29 '14 at 15:57

1 Answer 1

up vote 5 down vote accepted

To query the TXT record for DMARC, you can use:

dig TXT _dmarc.example.org

To query for a particular record for DKIM, you would need to know the selector prefix. You would then query it as TXT (for example with a google one):

dig TXT google._domainkey.example.org
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Worth mentioning is that in the DKIM-Signature header the selector name is found in the s= value. –  andol Aug 29 '14 at 16:50

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