dnsserver problem with aliases

I have a problem accessing URL´s that are aliases like squid.nlanr.net.

Error msg:

The requested URL could not be retrieved

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While trying to retrieve the URL: http://squid.nlanr.net/Squid/
The following error was encountered:
Unable to determine IP address from host name for squid.nlanr.net
The dnsserver returned:
DNS Domain 'squid.nlanr.net' is invalid: Host not found (authoritative).
This means that:
 The cache was not able to resolve the hostname presented in the URL.
 Check if the address is correct.
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Generated Fri, 04 Feb 2000 16:53:08 GMT by srv-http.dataaustria.com
(Squid/2.2.STABLE3)
but I can access squid-cache.org
Please Help