Bot intelligence record

Yahoo Japan SEO Crawler

Review first

Yahoo Japan SEO Crawler is a search crawler from Yahoo used for search indexing, URL discovery, page rendering, result freshness; it appears in server logs as `J-BRW`.

Search Indexing Verified Bot Confidence: Medium Verified: Yes robots.txt: No
Operator
Yahoo
Family
Yahoo
Type
Search
Source type
Documented
Last checked
2026-06-23

User-Agent Pattern

Yahoo
J-BRW
Verification note

User-agent strings are identification signals, not proof of identity. Confirm important allow, block, or rate-limit decisions with logs, DNS or IP evidence, request behavior, or operator documentation when available.

Robots.txt Snippet

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User-agent: J-BRW
Disallow: /

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Handling Guidance

Depends

Use this record as bot intelligence, then verify the request source and behavior before allowing, blocking, or rate limiting.

Yahoo Japan SEO Crawler is used for search indexing, URL discovery, page rendering, result freshness, and search-quality checks.

Record Details

Structured data
Operator
Yahoo
Family
Yahoo
Type
Search
Purpose
Indexing
Identity type
Verified Bot
Confidence
Medium
Last verified
2026-06-23
Last checked
2026-06-23
Source type
Documented
Verification
Verify Yahoo Japan SEO Crawler by matching `J-BRW` to Yahoo evidence, then checking reverse DNS, source-network ownership, signed request data, or published crawler documentation when available.
Spoofing risk
Yahoo Japan SEO Crawler has medium spoofing risk because user-agent strings can be copied; pair the match with DNS, IP, behavior, or operator evidence.

Notes

  • Yahoo Japan SEO Crawler is a search crawler from Yahoo used for search indexing, URL discovery, page rendering, result freshness, and search-quality checks.
  • Its primary user-agent pattern is J-BRW; related patterns include J-BRW/; a representative HTTP user-agent is Y!J-BRW/1.0 (https://support.yahoo-net.jp/PccSearch/s/article/H000007955).
  • Yahoo Japan SEO Crawler is verified with Medium confidence. The identity type is Verified Bot, and the evidence basis is a public crawler reference or source-linked documentation.
  • Yahoo Japan SEO Crawler is marked as not reliably governed by robots.txt directives; use server-side rules if the traffic should be restricted.
  • Yahoo Japan SEO Crawler should be reviewed against site policy, source evidence, crawl rate, and requested paths before a permanent allow or block rule is created.

Evidence and Source

  • Verify Yahoo Japan SEO Crawler by matching `J-BRW` to Yahoo evidence, then checking reverse DNS, source-network ownership, signed request data, or published crawler documentation when available.
  • Yahoo Japan SEO Crawler traffic is primarily detected by the `J-BRW` user-agent pattern; related patterns include `J-BRW/`; a representative HTTP user-agent is `Y!J-BRW/1.0 (https://support.yahoo-net.jp/PccSearch/s/article/H000007955)`. Compare source IPs, reverse DNS, request paths, and crawl cadence with Yahoo infrastructure before trusting the traffic.
  • Yahoo Japan SEO Crawler is used for search indexing, URL discovery, page rendering, result freshness, and search-quality checks.
  • Yahoo Japan SEO Crawler has medium spoofing risk because user-agent strings can be copied; pair the match with DNS, IP, behavior, or operator evidence.

https://support.yahoo-net.jp/PccSearch/s/article/H000007955

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