multiple sites, single IP

In brief, if you want to host multiple sites (on IIS) – and all you have is a single  IP , you have to use host-headers (in IIS). These host headers will identify the incoming target website and IIS can appropriately redirect to the appropriate target. However, if your sites require SSL, there is no way to accomplish this with a single IP (assuming each site has it’s own certificate).

Wildcart SSL Cert

A potential workaround is to use a wildcard cert  – which would allow multiple site bindings to a single IP.

Multiple IP addresses – Single Server

Of course, if you are not restricted from assigning additional IPs on the same server, you are all set. All you need is a unique IP for each website that you are hosting.

Cloud and Virtual IPs

In the cloud world, obtaining VIPs (Virtual IPs) for the same instance is a piece of cake. This makes hosting multiple sites on the same instance trivial in the cloud. Each site can have it’s own SSL cert or use a wildcard cert across all sites.

References

https://blogs.msdn.microsoft.com/varunm/2013/06/18/bind-multiple-sites-on-same-ip-address-and-port-in-ssl/

Specializing in high volume web and cloud application architecture, Anuj Varma’s customer base includes Fortune 100 companies (dell.com, British Petroleum, Schlumberger).
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Anuj Varma – who has written posts on Anuj Varma, Technology Architect.


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