MIC API responses — English translated excerpts

Source: 無線局等情報検索 Web-APIのリクエストの設定方法及び提供データの内容について, version 1.6.0, March 2025, MIC Japanese PDF. Translated 2026-09-17. Selected excerpts: overview, response behaviour, JSON field definitions and selected errors. Examples and duplicate CSV/XML field tables are omitted. Printed page 1 is PDF page 4.

Service and response behaviour — printed pp. 1–3 / PDF pp. 4–6

The service accepts search conditions and returns matching radio-station information through REST, in the requested CSV, JSON or XML format.

The count endpoint returns the number of matching licences or registrations. The list endpoint returns the matching list and individual licence or registration information. Both correspond to the portal's expert-search results.

Responses contain a data-update date and total count, followed by record information. Details differ by licence form: all form fields are output, with inapplicable fields left empty. Response encoding is UTF-8.

JSON header and count — printed pp. 10–11 / PDF pp. 13–14

Object / field	English meaning
`musenInformation.lastUpdateDate`	Data-update date, `YYYY-MM-DD`.
`musenInformation.totalCount`	Total matching records.
Count endpoint: `musen.count`	Retrieved count, equal to total matching records.

Licence list — table 6.2-1, printed pp. 11–13 / PDF pp. 14–16

musen contains station records with listInfo and detailInfo.

`listInfo` field	Japanese label	English meaning
`no`	No.	Item number.
`name`	名称	Licensee name and corporate number. Format: name + ASCII space + `法人番号` + 13 digits. Corporate number is omitted if absent.
`tdfkCd`	都道府県	Station installation location.
`radioStationPurpose`	無線局の目的	All purposes assigned to the station in one field, up to five.
`licenseDate`	免許の年月日	Licence date.

`detailInfo` field	Japanese label	English meaning
`name`	免許人の氏名又は名称	Licensee name, including blanket-license holder where applicable.
`address`	免許人の住所	Licensee address, including blanket-license holder where applicable.
`office`	包括免許人の事務所	Blanket-license holder's office.
`radioStationCategory`	無線局の種別	Station class or specified-station class.
`licenseNumber`	免許の番号	Licence number, blanket-licence number, or licence number/call name.
`licenseDate`	免許の年月日	Licence or blanket-licence date.
`validTerms`	免許の有効期間	Licence or blanket-licence validity period.
`radioStationPurpose`	無線局の目的	Station purpose; for basic broadcasting, also the type of broadcasting.
`radioStationNumber`	指定無線局数	Number of designated stations.
`permittedOperatingHours`	運用許容時間	Permitted operating hours.
`startingLimit`	運用開始の期限	Deadline for starting operation.
`broadcastMatter`	放送事項	Broadcasting matters.
`broadcastDistrict`	放送区域	Broadcast area.
`commMatter`	通信事項	Communication matters.
`commPartner`	通信の相手方	Communication counterpart.
`identificationSignals`	識別信号	Identification signal(s).
`radioEuipmentLocation`	無線設備の場所	Equipment base/installation location, permissible or proposed installation area, or movement area, depending on the form.
`movementArea`	移動範囲	Movement area.
`radioSpec1`	電波の形式、周波数及び空中線電力	Emission type, frequency and antenna power; unpopulated items are empty.
`workPersonName`	認定基幹放送事務者の氏名又は名称	Name of the accredited basic broadcaster.
`note`	備考	Remarks.

For amateur stations other than the satellite-related cases identified in the source, radioSpec1 outputs the collective frequency/emission designation. For personal-radio records, power is appended as space, tab, space, tab, power. For other applicable records, horizontal-scanning-period information is output between tab-separated spaces. These are form-specific contents of the same field.

If no records match, record information is not output.

Registration list — table 6.2-2, printed p. 13 / PDF p. 16

Registration listInfo fields are no (item number), name (registrant name and corporate number in the same format above), itCd (responsible bureau), registrationDate (registration date), and validTerms (validity period).

Registration detailInfo fields:

Field	English meaning
`name`	Registrant name.
`address`	Registrant address.
`radioEquipmentStandard`	Radio equipment standard.
`registrationNumber`	Registration number.
`registrationDate`	Registration date.
`validTerms`	Registration validity period.
`radioEuipmentLocation`	Equipment installation location, proposed installation area, or movement area.
`radioSpec2`	Emission type, frequency and antenna power.
`note`	Remarks.

Selected errors — table 4.2-1, printed pp. 4–5 / PDF pp. 7–8

Errors return an HTTP status and an error code/message in the requested format (CSV by default).

HTTP	Code	English translation
400	EQ00007	DC=3 cannot be specified when DA=1.
400	EQ00008	OW specifies a station class that does not exist.
400	EQ00009	OW2 specifies an equipment standard that does not exist.
429	EQ00429	The service is currently busy.
500	EQ90000	A system error occurred.

Translation notes

The source spells the location key radioEuipmentLocation; this spelling is preserved. These field definitions describe the form contents, not a promise that every value is publicly disclosed. The observed masked JOSADA values are recorded separately in API working notes.