Bot intelligence record
Yahoo Japan Y!J-ASR
Review firstYahoo Japan Y!J-ASR is a search crawler from Yahoo Japan Corporation used for search indexing, URL discovery, page rendering, result freshness; it appears in server logs as `Y!J-ASR`.
- Operator
- Yahoo Japan Corporation
- Family
- Yahoo Japan Corporation
- Type
- Search
- Source type
- Documented
- Last checked
- 2026-05-20
User-Agent Pattern
Yahoo Japan CorporationY!J-ASR
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
Click snippet to copyUser-agent: Y!J-ASR
Disallow: /Click the snippet to copy it, or highlight the text manually.
Handling Guidance
DependsUse this record as bot intelligence, then verify the request source and behavior before allowing, blocking, or rate limiting.
Yahoo Japan Y!J-ASR is used for search indexing, URL discovery, page rendering, result freshness, and search-quality checks.
Record Details
Structured data- Operator
- Yahoo Japan Corporation
- Family
- Yahoo Japan Corporation
- Type
- Search
- Purpose
- Indexing
- Identity type
- Verified Bot
- Confidence
- Medium
- Last verified
- 2026-04-01
- Last checked
- 2026-05-20
- Source type
- Documented
- Verification
- Verify Yahoo Japan Y!J-ASR by matching `Y!J-ASR` to Yahoo Japan Corporation evidence, then checking reverse DNS, source-network ownership, signed request data, or published crawler documentation when available.
- Spoofing risk
- Yahoo Japan Y!J-ASR has medium spoofing risk because user-agent strings can be copied; pair the match with DNS, IP, behavior, or operator evidence.
Notes
- Yahoo Japan Y!J-ASR is a search crawler from Yahoo Japan Corporation used for search indexing, URL discovery, page rendering, result freshness, and search-quality checks.
- Its primary user-agent pattern is
Y!J-ASR; related patterns includeY!J-BRJ/YATS crawler; Y!J-BRU/VSIDX; Y!J-BRW; Y!J-BRY/YATSH crawler; Y!J-BRZ/YATSHA crawler; Y!J-B|YJ-SAD; Y!J-MMP/dscv; Y!J-WSC; YJ-SAD; a representative HTTP user-agent isY!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. - Yahoo Japan Y!J-ASR is verified with Medium confidence. The identity type is Verified Bot, and the evidence basis is documented crawler-pattern evidence.
- Yahoo Japan Y!J-ASR does not have confirmed robots.txt behavior in the available public evidence.
- Yahoo Japan Y!J-ASR 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 Y!J-ASR by matching `Y!J-ASR` to Yahoo Japan Corporation evidence, then checking reverse DNS, source-network ownership, signed request data, or published crawler documentation when available.
- Yahoo Japan Y!J-ASR traffic is primarily detected by the `Y!J-ASR` user-agent pattern; related patterns include `Y!J-BRJ/YATS crawler; Y!J-BRU/VSIDX; Y!J-BRW; Y!J-BRY/YATSH crawler; Y!J-BRZ/YATSHA crawler; Y!J-B|YJ-SAD; Y!J-MMP/dscv; Y!J-WSC; YJ-SAD`; a representative HTTP user-agent is `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`. Compare source IPs, reverse DNS, request paths, and crawl cadence with Yahoo Japan Corporation infrastructure before trusting the traffic.
- Yahoo Japan Y!J-ASR is used for search indexing, URL discovery, page rendering, result freshness, and search-quality checks.
- Yahoo Japan Y!J-ASR has medium spoofing risk because user-agent strings can be copied; pair the match with DNS, IP, behavior, or operator evidence.
Monitor This Bot In Edge
Botcrawl EdgeUse Botcrawl Edge to see matching traffic, identify related datacenter activity, and create allow, block, rate-limit, or log rules across connected sites.