In our institution ISP provided us with a modem with only 1 working port. But 5 ips can be accessed using that port by directly plugging in network cable to a pc. Our organization's website only allows users having those 5 ip addresses to access it. Everything is fine as long as we only work 1 person at a time by plugging pc to that port. But when we used a switch in between and tried plugging in 5 pcs with those 5 static ips, we are not able to access the website as it says invalid domain. We can access the internet which means the ips are working. I need help accessing that website as there are multiple users which need work at the same time. I don't know if its safe to post those ip addresses here. Also I have no experience in networking. Any help? TY.
EDIT. When I checked my IP address using findmyip, it shows another address. Not the one I set in my network connection. How do I correct it?