Area code 21
Shanghai · Shanghai
- Area code
- 21
- Country
- China
- Region
- Shanghai
- Major cities
- Shanghai
- Time zone
- Asia/Shanghai
- Note
- Shanghai area code.
This is a domestic area code inside China. It is not the international calling code.
Frequently asked questions
Which cities use area code 21?
Area code 21 serves Shanghai in China, including Shanghai.
What region does area code 21 cover?
Area code 21 covers Shanghai. Area codes route calls to a specific city or region within a country's national telephone network.
What is the difference between an area code and a calling code?
A calling code routes a call across borders to a national network, while an area code routes it to a city or region inside that network. For a China number, the country calling code is the international prefix and 21 is the domestic area code.
What time zone is area code 21 in?
Area code 21 is in the IANA time zone Asia/Shanghai.
Is area code 21 the international calling code?
No. 21 is a domestic area code inside China, not the international calling code. To call this region from abroad, you dial the country's calling code first, then 21 and the local number.