blocking ip ranges on cisco asa 5500

access-list outside_access_out extended permit ip 192.168.1.0 255.255.255.0 any

also here is a whole tutorial on it.

http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a00800a5b9a.shtml

let me know your ip ranges ?  and your topology

you can do it with the help of access-list

or

follow the below url
http://www.buzzle.com/articles/how-to-configure-access-control-lists-on-a-cisco-asa-5500-firewall.html

The basic command format of the Access Control List is the following:

ciscoasa(config)# access-list "access_list_name" extended {deny | permit} protocol "source_address" "mask" [source_port] "dest_address" "mask" [ dest_port]

To apply the ACL on a specific interface use the access-group command as below:

ciscoasa(config)# access-group "access_list_name" [in|out] interface "interface_name"

something like:
asa(config)# access-list INSIDE_IN extended deny tcp 192.168.10.0 255.255.255.0 200.100.1.0 255.255.255.0
asa(config)# access-list INSIDE_IN extended deny tcp 192.168.10.0 255.255.255.0 host 210.100.1.1 eq 80
asa(config)# access-list INSIDE_IN extended permit ip any any
asa(config)# access-group INSIDE_IN in interface inside

The basic command format of the Access Control List is the following:

ciscoasa(config)# access-list "access_list_name" extended {deny | permit} protocol "source_address" "mask" [source_port] "dest_address" "mask" [ dest_port]

To apply the ACL on a specific interface use the access-group command as below:

ciscoasa(config)# access-group "access_list_name" [in|out] interface "interface_name" 

something like:
asa(config)# access-list INSIDE_IN extended deny tcp 192.168.10.0 255.255.255.0 200.100.1.0 255.255.255.0
asa(config)# access-list INSIDE_IN extended deny tcp 192.168.10.0 255.255.255.0 host 210.100.1.1 eq 80
asa(config)# access-list INSIDE_IN extended permit ip any any
asa(config)# access-group INSIDE_IN in interface inside 

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I still don't quite understand.  If I want to block a range of ip's say x.x.x.x.0 - x.x.x.255, how would that command look?

>I still don't quite understand.  If I want to block a range of ip's say x.x.x.x.0 - x.x.x.255, how would that command look?

you need to specify the source and destination networks, then allow everything else

asa(config)# access-list INSIDE_IN extended deny ip 192.168.10.0 255.255.255.0 200.100.1.0 255.255.255.0
asa(config)# access-list INSIDE_IN extended permit ip any any
asa(config)# access-group INSIDE_IN in interface inside 

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I tired the above config and it still doesn't work.   It seems straight forward but it doesn't stop the traffic??

how about you post your config, the networks  you want to block and we can try to assist. Please remove passwords, there is not much we can do with IP addresses.

Billy