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Yahoo Japan

GoodBotVerifiedBOT

Yahoo Japan Advertising Bot Operated by LY Corporation.

GoodBot
Assessment
Advertising & Marketing
Category
BOT
Kind
1
Data sources
AI-generated summary, drawn from Cloudflare, operator docs, and community data

What is Yahoo Japan?

The Y!J-BRU/VSIDX bot is operated by LY Corporation as part of the Yahoo! JAPAN advertising ecosystem. It systematically visits URLs associated with advertising campaigns to analyze page content, ensuring that the destination sites align with the advertiser's claims and adhere to the platform's strict advertising guidelines. By performing these automated checks, the bot helps maintain the integrity of the ad network and protects users from misleading or non-compliant content.

Helpful — This bot is essential for advertisers to maintain their ad campaigns and ensure that landing pages meet the quality and policy standards required by the Yahoo! JAPAN advertising platform.

Identification

Bot name
Yahoo Japan
Operator
LY Corporation
Category
Advertising & Marketing
Kind
BOT
Verification
Verified bot
Cloudflare slug
yahoo-japan
User-agent patterns
Y!J-ASRY!J-BRJ/YATS crawlerY!J-BRU/VSIDXY!J-BRWY!J-BRY/YATSH crawlerY!J-BRZ/YATSHA crawlerY!J-B|YJ-SADY!J-MMP/dscvY!J-WSCYJ-SAD
User-agent strings
Y!J-BRU/VSIDX
Y!J-BRW
Y!J-ASR
Y!J-MMP/dscv
Y!J-WSC
Y!J-BRJ/YATS crawler
Y!J-BRY/YATSH crawler
Y!J-BRZ/YATSHA crawler
YJ-SAD
Main use cases
Ad landing page verificationPolicy compliance checkingAd quality assessment
Rated Sep 23, 2026 from public evidence

How we rated this bot

Verified by Cloudflare, which confirms who runs it, with no widespread reports of abuse.

Names itself honestly
Yes
Verified by Cloudflare
Yes
Says it follows robots.txt and opt-outs
Not stated
Ignores site rules
None found
Disguises itself or evades blocks
None found
Overloads sites
None found
How widely people complain
No complaint about this bot in the evidence
Reddit discussion
There is no Reddit discussion of this bot in the evidence

What we read

Why it crawls your site

This crawler operates to facilitate the review process for Yahoo! JAPAN Ads, allowing the platform to automatically validate that landing pages are functional and relevant to the ads being displayed. It crawls websites to extract metadata and content, which are then evaluated against internal policy databases to determine ad eligibility. Site owners can verify the legitimacy of this traffic by checking that the requests originate from IP addresses associated with LY Corporation's verified infrastructure.

Block or allow Yahoo Japan

Block it

Add a Disallow rule for Y!J-ASR in your robots.txt file. You can also block at the server level using your web server configuration or CDN firewall rules to filter requests matching the user-agent string.

# Block Yahoo Japan from crawling your entire site
User-agent: Y!J-ASR
Disallow: /

# Allow Yahoo Japan full access
User-agent: Y!J-ASR
Allow: /
Allow & verify

Ensure your robots.txt allows Y!J-ASR. Verify requests by checking the user-agent string.

Traffic & trends

Cloudflare Radar traffic

No Cloudflare traffic data available.

Google Trends interest

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From the community

Recent Reddit discussion mentioning this bot.

Related bots

Other crawlers operated by LY Corporation.

YA
Yahoo Japan SEO Crawler
SEO
›

Links & references

LY Corporation documentation
yahoo.jp/3BSZgF
↗
Cloudflare Radar: Yahoo Japan
radar.cloudflare.com/traffic/bots/yahoo-japan
↗

Data sources

This profile is compiled from the following sources.

CloudflareRadar
Last updated October 25, 2026

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