Overview
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.
Identity
- User-Agent Pattern
-
J-BRW - Aliases
- J-BRW/
- HTTP Agent Examples
-
Y!J-BRW/1.0 (https://support.yahoo-net.jp/PccSearch/s/article/H000007955) - Robots Token
- J-BRW
- Identity Type
- Verified bot
- Evidence Method
- 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.
Classification
- Type
- Search
- Kind
- Crawler
- Family
- Yahoo
- Purpose
- Indexing
Behavior and handling
- Common Use
- Yahoo Japan SEO Crawler is used for search indexing, URL discovery, page rendering, result freshness, and search-quality checks.
- Detection Notes
- 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.
- Respects robots.txt
- No
- 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.
- Risk
- Neutral
- Recommended Handling
- Depends
Rules and controls
- Robots.txt Snippet
-
# This agent may ignore robots.txt. Use authenticated access controls or network policy when blocking is required.
Relationships
- Operator
- Yahoo Checked 2026-06-23
Relationships without an Evidence link are normalized from the canonical directory record. They should not be interpreted as independent proof of physical presence or request origin.