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what command (if any) could I use to block ad hosts such as doubleclick.net and atdmt.com in my PIX 501. I have a whole list of hosts to block already.. I just wanted to get the correct command to do so. 
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what command (if any) could I use to block ad hosts such as doubleclick.net and atdmt.com in my PIX 501. I have a whole list of hosts to block already.. I just wanted to get the correct command to do so. 

Blocking hosts using a PIX501

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.