It seems like an obvious win for your client network security, when it comes to visiting malicious hostnames: use an DNS server which denies certain hostnames based on some Realtime Block Lists (RBL). Similar to what can be used in parsing e-mails for spam points!
I read several places about OpenDNS, a great free DNS provider who does exactly what you would like, even with added administration to remove blacklists, see top queries etc. And they continue to improve the service and administration dashboard.
So check it out if you are administrating a client network intranet for example. Perhaps its is a bit too far using it for your servers :-)
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