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What is Yahoo Japan?

Direct Answer: Yahoo Japan Advertising Bot operated by Yahoo Japan Corporation for advertising purposes.

Operator: Yahoo Japan Corporation Type: Advertising Bot Purpose: Advertising

The Yahoo Japan Advertising Bot is a web crawler operated by Yahoo Japan Corporation. It is used for advertising-related activities. The bot uses various user-agents such as Y!J-BRU/VSIDX, Y!J-BRW, and Y!J-ASR. It does not follow robots.txt from the database.

User-Agent Identification

The following user-agent strings identify Yahoo Japan in your live traffic data:

  • 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

robots.txt Rules for Yahoo Japan

Respects robots.txt: No

This bot does not commit to following robots.txt

Yahoo Japan does not officially follow robots.txt directives. The only reliable way to control access is through server-side blocking (IP filtering, user-agent rules in your web server config) combined with log monitoring to verify effectiveness.

Need continuous verification across 500+ bots? Can AI See It automates this.

Crawl Behavior

Frequency:Not Documented

Request Pattern:Not Documented

Crawl Activity Index

Relative crawl activity for Yahoo Japan over the past 28 days. Higher values indicate increased crawling intensity compared to the period baseline.

View recent activity data (last 7 days)
Date Activity Index
Mar 26, 2026 88.0
Mar 27, 2026 82.7
Mar 28, 2026 83.1
Mar 29, 2026 81.8
Mar 30, 2026 87.3
Mar 31, 2026 90.2
Apr 1, 2026 88.8

Source: Cloudflare Radar

Why track Yahoo Japan traffic?

Verify ad system crawling behavior. Yahoo Japan evaluates your pages for ad targeting, quality scoring, and policy compliance.

Optimize ad delivery. If Yahoo Japan can't properly access certain pages, ad targeting and revenue may be impacted. Log monitoring confirms accessibility.

Log Verification

To verify Yahoo Japan traffic in your live traffic data:

  1. Search access logs for the user-agent strings listed above
  2. Check if the IP addresses match documented ranges (if provided by Yahoo Japan Corporation)
  3. Verify the crawl pattern matches documented behavior
  4. Use reverse DNS lookup for additional verification if available

Note: Observed behavior in production environments may differ from official documentation. Live traffic monitoring provides the only reliable verification of actual bot behavior.

Undocumented Information

The following information is not officially documented for Yahoo Japan:

  • crawl frequency
  • IP verification
  • JavaScript rendering
  • official quotes

Official Documentation

View Official Yahoo Japan Documentation →

Information sourced from official documentation. Content generated with AI assistance.