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Is it possible to create a wildcard host record for a sub-subdomain ie *.foo.example.com?

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Yes! . (15 min) –  Chris S Jan 18 '11 at 22:30
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up vote 4 down vote accepted

Yes, in the general case. DNS supports this, bind zonefiles support this. If you're using a management UI, you'll need to check what's supported by that.

@ORIGIN example.com.
; ...
*.foo  IN A  192.0.2.1

Note that if you create another record for an item in foo, then that will stop the wildcard from providing a record. Wildcards only match where no other name matches. So you'll need to explicitly provide the data that the wildcard would have provided.

@ORIGIN example.com.
; ...
*.foo       IN A    192.0.2.1
fred.foo    IN TXT  "Fred was here"
fred.foo    IN A    192.0.2.1
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Thanks - that is helpful. Not sure if my registrar supports this through its UI. –  eft Jan 18 '11 at 21:19
    
If your registrar is serving your DNS records, you can call them and ask them to help you set it up. –  cwheeler33 Jan 18 '11 at 21:39
    
let's hope so ! –  eft Jan 18 '11 at 22:06
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