IP Ranges ?
Can we define ip ranges in pfsense e.g.
I have local network 192.168.1.0/24. Now I want to block
FTP traffic for these ips
192.168.1.20 - 192.168.1.50
and block ssh access for these ips
192.168.1.70 - 192.168.1.90
You should be able to make an Alias for that, and use that alias in your block rules.
It would be helpful to have more detail of your configuration and what you are trying to block.
For example, if you are trying to block 192.168.1.x from access to FTP on 192.168.1.20 through 192.168.1.50 then the firewall won't help because that traffic bypasses the firewall.
On 2.0 you can use ranges in an alias, but what it really does is translate that alias into an equivalent set of CIDR masked proper subnets.
On 1.2.3 you can get this functionality by installing the package for IP Ranges in aliases.