There certainly are ways to save yourself IP addresses, but I do not know if this will apply to you because you do not mention what these IP addresses are used for. In the case that they are servers that offer specific services, you could possibly put a firewall in front of them and use Port Address Translation (PAT) map services to see internal private IP addresses, therefore saving yourself IP addresses. If you would like more information on how NAT/PAT works so you can examine if this is appropriate for you, please visit Introduction to Network Address Translation (NAT).
In the case that these real IP addresses are clients (e.g., dial-up clients of your ISP), then using any type of NAT will create problems and is not recommended.
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