Radiko Explained

Radiko (ラジコ), stylized in lower-case lettering as radiko, is a Japanese IP simul radio service operated by radiko Co., Ltd. The service started in March 2010. The catchphrase is "There is sound that expands the world."

History

Radiko was created as part of a research project in 2007 in Osaka. Six local radio stations began a pilot broadcast using IPv6 on March 5, 2008, limited to Osaka Prefecture.^[1]

The pilot Radiko service started on March 15, 2010, receiving 300,000 unique visits and 1,050,000 total visits in its first day.^[2] causing its servers to overwhelm.^{[3] [4]}

Radiko Premium

Radiko launched Radiko Premium on April 1, 2014. The basic service can be used for free, but certain functionalities require a subscription.^[5]

Podcasts

Radiko started podcasts services on February 14, 2024. It offers a mix of original and existing podcasts.^[6]

Notes and References

1. Web site: 『関西におけるIPラジオの取り組み『IPラジオ-RADIKO』について』. IPラジオ研究協議会. 24 March 2008.
2. News: IPラジオ「radiko」好反響、初日聴取人数105万人、急きょシステム増強 . 文化通信.com . 17 March 2010 . 29 March 2020 . https://web.archive.org/web/20100322213450/http://www.bunkatsushin.com/modules/bulletin/article.php?storyid=38868 . 22 March 2010 .
3. News: IPサイマルラジオ：アクセス殺到で混乱 . 毎日jp . 毎日新聞社 . 15 March 2010 . 29 March 2020 . https://web.archive.org/web/20100322231146/http://mainichi.jp/select/wadai/news/20100315k0000e040059000c.html . 22 March 2010.
4. News: 民放ラジオ、ネットで同時配信 首都圏・関西でスタート . asahi.com . 朝日新聞社 . 15 March 2010 . 29 March 2020 .
5. Web site: ラジコプレミアムをWEBから登録したときとアプリ内課金で登録したときの違いはありますか｜radiko ヘルプ. radiko. 20 September 2022. 7 October 2022.
6. https://radiko.jp/#!/info/2663 ポッドキャスト機能のリリースに関してのお知らせ