numbering plan
Technical term in telecommunications and computing for a scheme that assigns and manages telephone numbers or other identifiers.
The new numbering plan will be implemented from next year.
In this country, the numbering plan for mobile phones has been changed.
Refers to a specific telephone number, while 番号計画 is the system or plan for assigning such numbers.
Compound of 番号 (number) and 計画 (plan). A straightforward modern technical term.