I confess - I'm a tad lost.

Our ISP has provided us with several additional IP addresses for our ADSL2 account. The email they sent specified ip addresses with subnet 255.255.255.240:

203.214.69.1/28 to 203.214.69.14/28
gw: 203.206.182.192

I'm attempting to add them as aliases to the connection in our firewall configuration (so I can subsequently create some 1-1 NAT rules to expose our internal webservers).

When adding aliases in our firewall's connection configuration should I use 28 or 32 as the subnet mask?

How can an internet address have a subnet as 28? Perhaps I'm seriously mistaken, but i thought the Internet had the highest resolution when it came to addresses. 

Ok - let me have it. 

thanks everyone,

ashley