You can have /30 for your outside interface connected to router. You can have one /29 for your server which you can have for your DMZ interface,server and switch VLAN where you can connect... one /30 you can reserve for PAT/NAT.
Say 18.104.22.168/28 is your public IP subnet stack.
22.214.171.124/30 - 126.96.36.199 for your router and 188.8.131.52 for your outside interface of firewall.
184.108.40.206/29 - 220.127.116.11 for DMZ interface, 18.104.22.168 for Switch in DMZ, 22.214.171.124 for Server in DMZ (you can add 3 more servers and name 20.0.08,9,10 in future)
126.96.36.199/30 is the reserved subner for future use. hope this helps.
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