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I-numbers are one form of an XRI - an abstract identifier designed for sharing resources and data across domains and applications. I-numbers are persistent, machine-friendly XRIs (similar to IP addresses) that are registered once to a resource (person, organization, application, file, digital object, etc.) and never reassigned. This means they can always be used to address a network representation of the resource so as long it remains available somewhere on the network. I-names are the other form of XRIs that serve a different purpurse - to be the simplest, most human-friendly identifiers possible. Although intended to be very long-lived, an i-name can be reassigned the same way a domain name can be reassigned. In most cases an i-name is just an easy way to reference an unchanging i-number, the same way a domain name is an easy way to reference an IP address.
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