Communications
- The E.164 numbering plan for telephone numbers, including:
- Country calling codes
- North American Numbering Plan
- Numbering plans by country
- Argentina: Argentine telephone numbering plan
- Australia: Australian telephone numbering plan
- China: China telephone numbering plan
- France: French telephone numbering plan
- Hong Kong: Hong Kong telephone numbering plan
- Japan: Japanese telephone numbering plan
- Singapore: Singapore telephone numbering plan
- United Kingdom: UK telephone numbering plan
- The IP address allocation scheme (IANA)
- The DNIC prefixes of X.25 NUAs assigned by the ITU http://www.itu.int
Read more about this topic: Numbering Scheme