There are many different numbering schemes for assigning numbers to entities. These generally require an agreed set of rules, or a central coordinator.
Numbering schemes include:
The E.164 numbering plan for telephone numbers, including:
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Islandia, New York
Islandia is a village located in Suffolk County, New York. As of the 2000 census, the village had a total population of 3,057.
Geography ...