0423 area code — Kokubunji
Phone numbers in Kokubunji, Japan use the area code 0423. It falls within Tokyo. Numbers are written internationally as +81 423.
How to call Kokubunji
- From abroad
- +81 423 XXX XXXX
- Within Japan
- 0423 XXX XXXX
- Country calling code
- +81
About the 0423 area code
Locally the code appears as 0423; from outside Japan you replace the leading 0 with +81 423.
Area codes like 0423 tie a phone number to a place — useful for knowing where a call or message originates, and for signing up to services that expect a local Japan number. To actually receive an SMS on a Japan number, a temporary or virtual line does the job without exposing your own SIM.
Frequently asked questions
What area code is Kokubunji?
Kokubunji uses the area code 0423, written internationally as +81 423.
How do I call Kokubunji from another country?
Dial your international access code, then +81 423, then the local number — dropping the national leading 0.
What time is it in Kokubunji?
Kokubunji is in the Asia/Tokyo time zone; the live clock above shows the current local time.
Is 0423 a mobile or a landline code?
0423 is a geographic (landline) area code for Kokubunji. Mobile numbers in Japan use their own separate prefixes.