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Japan’s DOOH DSP/SSP platform MASTRUM and Moving Walls connect 34,000 ad screens in the first phase of expansion to 400,000 screens

Thursday, October 12, 2023 · Promoted content

DOOH Platform “MASTRUM” Launches First Phase on 34,000 Screens Across Japan

12th October, Tokyo; Japan — MASTRUM, the impression-based digital OOH (Out-of-Home) advertising platform launched by JR East Marketing & Communications Inc. (jeki) in partnership with Moving Walls Group earlier this year has completed integration of about 34,000 screens as part of its first phase

MASTRUM is a white-labeled, customized DSP/SSP platform tailored to the Japanese OOH advertising market. It is powered by Moving Walls, the global OOH enterprise software provider. With a focus on “visualization of advertising cost-effectiveness” and “automation of media transactions,” MASTRUM is set to be the largest OOH media platform in Japan. More than 400,000 OOH sites are planned to be on the platform in the future.

MASTRUM plans to expand its reach across various media types, including nationwide railroad companies, city halls, and even emerging metaverse and other digital ad spaces. This strategic expansion will open doors for advertisers to tap into new and highly efficient advertising opportunities across Japan. More details will be announced at Ad-Tech Tokyo 2023, which will be held on October 19th.

Commenting on the launch, Srikanth Ramachandran, Founder and Group CEO of Moving Walls, said, “Today signifies a significant breakthrough in our partnership with Jeki as we introduce Mastrum, a fully measurable and automated solution tailored for the Japanese market. Mastrum is now operational with pilot clients, boasting over 30,000 media assets onboarded. I firmly believe that information technology doesn’t just add linear value but exponential potential to out-of-home (OOH) media. The platform will soon provide accessibility to over 400,000 advertising faces across Japan making it the widest reaching media option in the country. It presents an exciting opportunity for global advertisers and omnichannel advertising platforms to grow their own reach here.”

For more information about this article please contact and for more information about MASTRUM, please visit :


Moving Walls is a media technology group with a presence across four continents and seven markets. Its supply-side subsidiary, Location Media Xchange (LMX) automates media owner processes and equips their assets with capabilities for enhanced and efficient delivery of OOH media.

jeki was established in 1988 as the first strategic subsidiary of East Japan Railway Company. Although sometimes perceived as East Japan Railway’s house agency or a management company specializing in transportation media, jeki is a general advertising agency that derives 70% of its total revenue from clients outside the group. It also manages digital platforms, content and other businesses for government agencies and other organizations.


Published on Thursday, October 12, 2023 at 12:11 AM

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