---
title: "au: MCC 440 MNC 51"
mcc: "440"
mnc: "51"
plmn: "44051"
tadig: "JPNKI"
brand: "au"
operator: "KDDI Corporation"
country: "Japan"
country_iso: "JP"
region: "Asia & Middle East"
technologies: ["2G", "4G"]
updated: "2025-04-09"
canonical: "https://mcc-mnc.org/networks/440_51"
---

# au: MCC 440, MNC 51 (Japan)

**au** (operator: KDDI Corporation) is a mobile network in [Japan](https://mcc-mnc.org/countries/japan.md) (Asia & Middle East), identified by MCC **440** and MNC **51**: PLMN ID 44051, also written 440-51 or 440 51, with the TADIG roaming code **JPNKI**. It runs 2G and 4G. Calling: VoLTE: Likely.

## Identifiers

| Field | Value |
|---|---|
| MCC (Mobile Country Code) | 440 |
| MNC (Mobile Network Code) | 51 |
| PLMN ID (MCC+MNC) | 44051 |
| TADIG code | JPNKI |
| Brand | au |
| Operator | KDDI Corporation |
| Country | Japan (JP) |
| Region | Asia & Middle East |
| Dialling code | — |
| Technologies | 2G, 4G |
| Last updated | 2025-04-09 |

## Technologies & bands

| Generation | Bands | Measured cells |
|---|---|---|
| 2G | [CDMA 850](https://mcc-mnc.org/coverage/cdma_850.md), [CDMA 2100](https://mcc-mnc.org/coverage/cdma_2100.md) | — |
| 3G | No bands on file | 4,532 |
| 4G | [LTE 700](https://mcc-mnc.org/coverage/lte_700.md), [LTE 2100](https://mcc-mnc.org/coverage/lte_2100.md), [LTE 850](https://mcc-mnc.org/coverage/lte_850.md), [TD-LTE 3500](https://mcc-mnc.org/coverage/td-lte_3500.md), [LTE 1500](https://mcc-mnc.org/coverage/lte_1500.md) | 123,654 |
| 5G | No bands on file | 84 |

## Voice & calling services

| Service | Status | Source |
|---|---|---|
| VoLTE | Likely | Network publishes an IMS APN |
| VoWiFi | Unknown | — |
| ViLTE | Unknown | — |
| VoNR | Unknown | — |

A service not marked Supported or Not supported is unknown: no data either way, not a sign that the network lacks it.

## 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.

## MVNOs on au

- [J:COM MOBILE](https://mcc-mnc.org/mvno/j-com-mobile.md)
- [povo](https://mcc-mnc.org/mvno/povo.md)
- [UQ mobile](https://mcc-mnc.org/mvno/uq-mobile.md)

## APN settings

| Name | APN | Types | Protocol | Username | Password | MMSC | MMS proxy | MMS port | Source |
|---|---|---|---|---|---|---|---|---|---|
| AEON MOBILE | `i-aeonmobile.com` | cbs, default, fota, hipri, ia, mms, supl | — | `user` | `0000` | — | — | — | LineageOS |
| au(5G NET for DATA) | `au5g.au-net.ne.jp` | cbs, default, fota, hipri, ia, mms, supl | — | `user@au5g.au-net.ne.jp` | `au` | — | — | — | LineageOS |
| au(5G NET) | `uad5gn.au-net.ne.jp` | cbs, default, fota, hipri, ia, mms, supl | — | `au@uad5gn.au-net.ne.jp` | `au` | — | — | — | LineageOS |
| au(LTE NET for DATA) | `au.au-net.ne.jp` | cbs, default, fota, hipri, ia, mms, supl | — | `user@au.au-net.ne.jp` | `au` | — | — | — | LineageOS |
| au(LTE NET) | `uno.au-net.ne.jp` | cbs, default, fota, hipri, ia, mms, supl | — | `685840734641020@uno.au-net.ne.jp` | `KpyrR6BP` | — | — | — | LineageOS |
| BIGLOBEモバイル(タイプA) | `biglobe.jp` | cbs, default, fota, hipri, ia, mms, supl | — | `user` | `0000` | — | — | — | LineageOS |
| IIJmio(タイプA) | `iijmio.jp` | cbs, default, fota, hipri, ia, mms, supl | — | `mio@iij` | `iij` | — | — | — | LineageOS |
| J:COM MOBILE(Aプラン) | `jcommobile.jp` | cbs, default, fota, hipri, ia, mms, supl | — | `jcom@jcommobile.jp` | `jcom` | — | — | — | LineageOS |
| LINEモバイル(A) | `line.me` | cbs, default, fota, hipri, ia, mms, supl | — | `line@line` | `line` | — | — | — | LineageOS |
| mineo(auプラン) | `mineo.jp` | cbs, default, fota, hipri, ia, mms, supl | — | `mineo@k-opti.com` | `mineo` | — | — | — | LineageOS |
| nuromobile(A) | `so-net.jp` | cbs, default, fota, hipri, ia, mms, supl | — | `nuro` | `nuro` | — | — | — | LineageOS |
| povo2.0 | `povo.jp` | cbs, default, fota, hipri, ia, mms, supl | IPV4V6 | — | — | — | — | — | LineageOS |
| Rakuten | `a.rmobile.jp` | default, ia, supl | — | `rakuten@vdm` | `0000` | — | — | — | AOSP |
| UQ mobile | `uqmobile.jp` | default, hipri, ia, mms, supl | IPV4V6 | `uq@uqmobile.jp` | `uq` | `http://mms.ezweb.ne.jp/MMS` | — | 80 | LineageOS |
| IMS | `ims` | ims | IPV4V6 | — | — | — | — | — | LineageOS |

Settings come from Android's AOSP and LineageOS APN lists and user corrections.

## Android carrier config highlights

| Setting | Value | Key |
|---|---|---|
| Allow emergency numbers in call log | Yes | `allow_emergency_numbers_in_call_log_bool` |
| Call settings over Ut/XCAP | Yes | `carrier_supports_ss_over_ut_bool` |
| 5G icon display grace period | connected_mmwave,legacy,31;connected,legacy,31;connected_mmwave,not_restricted_rrc_con,31;connected,not_restricted_rrc_con,31;not_restricted_rrc_idle,not_restricted_rrc_con,15 | `5g_icon_display_grace_period_string` |
| 5G icon rules | connected_mmwave:5G,connected:5G,not_restricted_rrc_idle:5G | `5g_icon_configuration_string` |
| NR timers reset if non endc and rrc idle | Yes | `nr_timers_reset_if_non_endc_and_rrc_idle_bool` |
| Default MTU | 1420 | `default_mtu_int` |
| Show 4G for LTE data icon | Yes | `show_4g_for_lte_data_icon_bool` |
| Disable DUN APN while roaming with preset APN | Yes | `disable_dun_apn_while_roaming_with_preset_apn_bool` |
| Carrier name overridden | Yes | `carrier_name_override_bool` |
| Carrier name override | au | `carrier_name_string` |
| SIM country iso override | jp | `sim_country_iso_override_string` |

## Cell towers

OpenCelliD has measured **128,270** cells on this network across 1,921 location/tracking areas, first seen 2015-03-10 and last seen 2026-09-17 (data as of 2026-09-27).

| Radio | Generation | Cells |
|---|---|---|
| UMTS | 3G | 4,532 |
| LTE | 4G | 123,654 |
| NR | 5G | 84 |

Locate a single cell by MCC, MNC, LAC/TAC and cell ID with the https://mcc-mnc.org/cell-id-lookup tool, `GET /api/v1/cells` or the MCP `lookup_cell` tool. Cell data from OpenCelliD (https://opencellid.org), licensed CC BY-SA 4.0.

## Other networks in Japan

| MCC | MNC | Network | TADIG |
|---|---|---|---|
| 440 | 00 | [Y Mobile](https://mcc-mnc.org/networks/440_00.md) | — |
| 440 | 01 | [UQ WiMAX](https://mcc-mnc.org/networks/440_01.md) | — |
| 440 | 02 | [Hanshin Cable Engineering Co., Ltd.](https://mcc-mnc.org/networks/440_02.md) | — |
| 440 | 03 | [IIJmio](https://mcc-mnc.org/networks/440_03.md) | — |
| 440 | 04 | [Japan Radio Company, Ltd.](https://mcc-mnc.org/networks/440_04.md) | — |
| 440 | 05 | [Wireless City Planning Inc.](https://mcc-mnc.org/networks/440_05.md) | — |
| 440 | 06 | [SAKURA Internet Inc.](https://mcc-mnc.org/networks/440_06.md) | — |
| 440 | 07 | [LTE-X, Inc.](https://mcc-mnc.org/networks/440_07.md) | — |
| 440 | 08 | [Panasonic Systems Solutions Japan Co., Ltd.](https://mcc-mnc.org/networks/440_08.md) | — |
| 440 | 09 | [Marubeni Wireless Communications Inc.](https://mcc-mnc.org/networks/440_09.md) | — |
| 440 | 10 | [NTT docomo](https://mcc-mnc.org/networks/440_10.md) | JPNDO |
| 440 | 11 | [Rakuten Mobile Network, Inc.](https://mcc-mnc.org/networks/440_11.md) | — |
| 440 | 12 | [Cable media waiwai Co., Ltd.](https://mcc-mnc.org/networks/440_12.md) | — |
| 440 | 20 | [SoftBank](https://mcc-mnc.org/networks/440_20.md) | JPNJP |
| 440 | 21 | [SoftBank](https://mcc-mnc.org/networks/440_21.md) | — |
| 440 | 50 | [au](https://mcc-mnc.org/networks/440_50.md) | — |
| 440 | 52 | [au](https://mcc-mnc.org/networks/440_52.md) | — |
| 440 | 53 | [au](https://mcc-mnc.org/networks/440_53.md) | — |
| 440 | 54 | [au](https://mcc-mnc.org/networks/440_54.md) | — |
| 440 | 70 | [au](https://mcc-mnc.org/networks/440_70.md) | — |
| 440 | 71 | [au](https://mcc-mnc.org/networks/440_71.md) | — |
| 440 | 72 | [au](https://mcc-mnc.org/networks/440_72.md) | — |
| 440 | 73 | [au](https://mcc-mnc.org/networks/440_73.md) | — |
| 440 | 74 | [au](https://mcc-mnc.org/networks/440_74.md) | — |
| 440 | 75 | [au](https://mcc-mnc.org/networks/440_75.md) | — |
| 440 | 76 | [au](https://mcc-mnc.org/networks/440_76.md) | — |
| 440 | 78 | [au](https://mcc-mnc.org/networks/440_78.md) | — |
| 440 | 91 | [Tokyo Organising Committee of the Olympic and Paralympic Games](https://mcc-mnc.org/networks/440_91.md) | — |
| 441 | 01 | [SoftBank](https://mcc-mnc.org/networks/441_01.md) | — |
| 441 | 10 | [UQ WiMAX](https://mcc-mnc.org/networks/441_10.md) | — |

---

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