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I would like to create subdomain and then fourth level wildcard subdomain DNS record over that one. I mean * Is this possible ? and if so how ?

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What are you using to serve out DNS records? If it's bind, it should be straightforward enough. – Andy Smith Sep 12 '11 at 18:34
I use – chubbyk Sep 12 '11 at 18:37
A quick google throws up…. Never used them, so I can't help further unfortunately. – Andy Smith Sep 12 '11 at 18:44

Wildcards are possible at any level. The only limit, which applies to both wildcards and normal subdomains, is that there can be at most 63 dot-separated components.

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