Thanks John for your reply. Because I am not network person so need some clearity on this point. I will allocate one Public IP to my router and then enable NAT on router and then all 8 users will be able to go on internet at the same time. As my understand. On the other hand can I also purchase more IP for my LAN. These are all public IP's and I will have to pay.
You should evaluate your options before purchasing a ton of addresses. What services will you be offering to the public? If you're going to be hosting websites for customers, you'd need several public addresses, but if you're going to be hosting servers inside of your office for your own purpose, many times you can NAT the traffic to different servers like:
public IP 18.104.22.168 --> private IP 192.168.1.50 on port 25 (mail server)
public IP 22.214.171.124 --> private IP 192.168.1.50 on port 80 (web server)
public IP 126.96.36.199 --> private IP 192.168.1.50 on port 21 (ftp server)
Private IP 192.168.1.50 is only open on ports 21,25, and 80, which would be a web server. You wouldn't necessarily need many public IP addresses to do this. You can even port forward to different servers, same public IP, but to different internal servers like:
public IP 188.8.131.52 on 80 --> private IP 192.168.1.50 on port 80 (web server)
public IP 184.108.40.206 on 21 --> private IP 192.168.1.200 on port 21 (ftp server)
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