Japan
JapanJP
PLMN ID · 44051
MCC
Mobile Country Code
MNC
Mobile Network Code
PLMN
MCC + MNC
TADIG
GSMA roaming code
Technology
2G · 4G on this network
Record
Updated 2025-04-09
- Brand
- au
- Operator
- KDDI Corporation
- Country
- Japan(JP)
- Region
- Asia & Middle East
- Dialling code
- —
- Mobile Country Code
- All 29 networks on MCC 440
- Mobile Network Code
- PLMN ID
- What is a PLMN ID?
- TADIG code
- TADIG directory
- Technologies
- 2G · 4G7 bands on file
- VoLTE (4G calling)
- LikelyNetwork publishes an IMS APNReport
- Wi-Fi calling
- UnknownTell us
- Video calling
- UnknownTell us
- VoNR (5G calling)
- UnknownTell us
- Status
- Live
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MVNOs
Add an MVNOMVNOs sell their own SIMs and plans but run on au's network rather than owning one.
| Brand | Calling | APNs | |
|---|---|---|---|
| J:COM MOBILE | |||
| povo | |||
| UQ mobile |
Regional Global SIM using au's numbering
Cell towers
Last measured 2026-09-17
128,270
Cells
1,921
Location areas
2,430,204
Measurements
2015
First measured
Find a cell on this network
> Enter a cell ID from this network, or press Example, to see where the cell is and how far it reaches.
Crowd-sourced cell measurements from OpenCelliD, licensed CC BY-SA 4.0 · as of 2026-09-27. Counts are cells people have measured, not an operator's own figures.
About au
KDDI Corporation, operating under the brand "au," is a major mobile network operator in Japan, playing a crucial role in the country's telecommunications landscape. Identified by the Mobile Country Code (MCC) 440, which designates Japan, and the Mobile Network Code (MNC) 51, "au" provides a wide range of mobile services to millions of subscribers across the nation. As one of the "big three" mobile carriers in Japan, alongside NTT Docomo and SoftBank, KDDI au competes fiercely in terms of coverage, speed, and innovative service offerings. Known for its extensive network infrastructure and commitment to technological advancement, KDDI au offers 4G LTE and rapidly expanding 5G services, ensuring reliable connectivity for both individual consumers and businesses. Beyond basic connectivity, "au" often bundles its mobile plans with other services, such as internet and entertainment, adding value for its customers. Furthermore, the carrier actively participates in developing and deploying new technologies, contributing to Japan's position as a leader in mobile technology within Asia and the broader Middle East region, even though its primary operations are within Japan itself.
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