Is it possible to block resolution of a malware address?

[Stewart Dean]

That is, if we know that a symbolic address is malign, is there some way to 
refuse to resolve it or change its resolution when an internal users asks for 
its resolution?

All my Google searching turns up DNSBLs and blocking incoming mail from BLed 
addresses, but this is another matter...

Thanks in advance...
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Stewart Dean, Unix System Admin, Henderson Computer Resources
Center of Bard College, Annandale-on-Hudson, New York  12504
sdean at bard.edu  voice: 845-758-7475, fax: 845-758-7035