What is the model of your Belkin router? The 8 IP allocation will be something like this (let's assume Zen have assigned you 188.8.131.52/29 (subnet mask: 255.255.255.248)
184.108.40.206 - Network Address (Not Usable)
220.127.116.11 - First usable IP
18.104.22.168 - Second usable IP
22.214.171.124 - Third usable IP
126.96.36.199 - Fourth usable IP
188.8.131.52 - Fifth usable IP
184.108.40.206 - Assigned to the router
220.127.116.11 - Broadcast Address (Not usable).
Your router should pick up it's address automatically when you login and assign it to it's WAN interface. If your router allows it, you can use the same address on the LAN side of the router. On your PC you then assign it one of the other free IP addresses in your range (with the correct default gateway and subnet mask). You will then appear on the internet as "that IP" rather than being NAT'ed. Be warned though you will be open to the internet and should have a suitable firewall / protection in place.
Hope this helps.
Zen Pro - "Up to 20Mbit Broadband"