Bot intelligence record

Yahoo Japan Y!J-ASR

Review first

Use the Y!J-ASR identifier to separate Yahoo Japan Corporation search indexing or content discovery traffic from normal visitor requests in server logs.

Search Indexing Verified Bot Confidence: Medium Verified: Yes robots.txt: No
Operator
Yahoo Japan Corporation
Type
Search
Source type
Verified Directory
Last checked
2026-05-20

User-Agent Pattern

Yahoo Japan Corporation
Y!J-ASR
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: Y!J-ASR 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.

Search indexing, content discovery, rendering, or search-result freshness 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
Verified Directory
Verification
Validate the identifying user-agent or signature against the operator documentation before creating hard allow rules.
Spoofing risk
User-agent strings can be spoofed. For allow-listing or low-friction rules, pair the published identifier with operator documentation or cryptographic verification when available.

Notes

Yahoo Japan Y!J-ASR is listed in the Botcrawl directory as a search crawler from Yahoo Japan Corporation. The primary identifier for log review is Y!J-ASR.

Identification

  • User-agent pattern: Y!J-ASR
  • Family: Yahoo Japan Corporation
  • Type: Search
  • Kind: Crawler

Common use

Search indexing, content discovery, rendering, or search-result freshness checks.

Verification and handling

Confirm the user-agent against server logs and use published operator documentation, IP ranges, reverse DNS, or other trust signals when available.

Directory guidance marks the risk level as Neutral and the blocking decision as Depends. Do not rely on the user-agent string alone because user-agent strings can be copied or spoofed.

Robots.txt handling: No.

Evidence and Source

  • Validate the identifying user-agent or signature against the operator documentation before creating hard allow rules.
  • Match `Y!J-ASR` as a case-insensitive substring in HTTP user-agent logs. Review bot_aliases for alternate names or product labels. Use bot_http_agent for full user-agent examples when the client sends a longer browser-like string. Do not treat a user-agent match alone as proof of identity for allow-listing.
  • Search indexing, content discovery, rendering, or search-result freshness checks.
  • User-agent strings can be spoofed. For allow-listing or low-friction rules, pair the published identifier with operator documentation or cryptographic verification when available.

https://yahoo.jp/3BSZgF

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