Why was the RFC 1918 address space defined?
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The RFC 1918 address space was defined by the Internet Engineering Task Force (IETF) to address the issue of IPv4 address exhaustion. The pool of available public IPv4 addresses was limited, and organizations were finding it difficult to obtain sufficient addresses for their networks.
To address this issue, RFC 1918 defined three ranges of private IP addresses that can be used within an organization's network without being globally routable on the internet. These private IP addresses are not unique and can be reused in different networks without causing conflicts with public IP addresses.
The three ranges of private IP addresses defined in RFC 1918 are:
Using private IP addresses in an organization's network helps to conserve public IPv4 addressing by allowing multiple devices to share a single public IP address through network address translation (NAT). NAT allows private IP addresses to be translated to a public IP address when communicating with devices outside the organization's network.
RFC 1918 also helps to reduce instances of overlapping IP addresses, as private IP addresses are not globally unique and can only be used within an organization's network. This avoids conflicts that can occur when two organizations use the same public IP address range for their networks.
RFC 1918 has been widely adopted and is used by most organizations today to help conserve public IPv4 addressing and reduce instances of IP address conflicts.