I-number or (i-num) is a Unique Identifier within the current Context.

I-number is a method to use Best Practices For Unique Identifiers.

I-number XRI#

I-numbers are machine readable identifiers (similar to IP Addresses) that are assigned to a resource (for instance, a person, organization, application or file) and never reassigned. This means an I-number can always be used to address a network representation of the resource as long it remains available anywhere on the network. I-numbers, like IP addresses, are designed to be efficient for network routers to process and resolve.

I-number are a form of an XRI resolution protocol can be used to resolve either an i-name or an I-number to an XRDS document describing the target resource.


I-number may be a persistent number registered to people, organizations and objects in the Extensible Resource Identifier system for consistent naming across the Internet.

I-number is often used to solve the problem of how any web resource can have a persistent Identifier that never changes even when the web resource moves or changes its human-friendly name.

For example, if a web page has an I-number, and links to that page use the i-number, then those links will not break even if the page is renamed, the website containing the page is completely reorganized, or the page is moved to another website.


Many LDAP implementations are designed using a I-number or a UUID for naming the LDAP Entries within the LDAP server Context. Using the Best Practices For Unique Identifiers

Linux and UNIX#

I-number may be an index entry within a File System that uses inode

More Information#

There might be more information for this subject on one of the following: