[dns-operations] *.cn A wildcard

Francisco Arias francisco at arias.com.mx
Mon Oct 26 20:55:06 UTC 2009

2009/10/26 Chris Thompson <cet1 at cam.ac.uk>:
> On Oct 26 2009, Francisco Arias wrote:
>> If you try an IDN there seems to be expansion
> [...]
> Yes - nice call.
> The rule seems to be that the second level component has to start "xn--"
> for wildcard expansion to occur. Valid Punycode after that is not required.
> And of course they have failed to apply this hack to ns.cernet.net.

It also happens for that server. The domain cernet.net is registered
to "Network Center,China Education and Research Network" by the way.

Since this is not wildcard expansion, how would you call this behavior?


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