The ITU international point codes are made up of three groups of digits called zone, area, and id. The range of varnames for ITU International point codes are:

• zone-0-7
• area-000-255
• id-0-7

An ITU international point code containing all zeros (0-000-0) is not a valid point code and cannot be entered into the database.

ITU international point codes support the Spare Point Code subtype prefix (s-). The prefix can be specified before the point code subfield varnames to indicate a Spare Point Code (s-5-222-1, for example). See Spare and Private Point Code Subtype Prefixes.