Bot intelligence record

Yahoo! JAPAN J-DLC

Usually allow

Yahoo! JAPAN J-DLC is a search crawler from Yahoo! JAPAN used for search indexing, URL discovery, page rendering, result freshness; it appears in server logs as `J-DLC`.

Search Indexing Verified Bot Confidence: Medium Verified: Yes robots.txt: Yes
Operator
Yahoo! JAPAN
Family
Yahoo! JAPAN
Type
Search
Source type
Documented
Last checked
2026-06-23

User-Agent Pattern

Yahoo! JAPAN
J-DLC
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-DLC
Disallow: /

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Handling Guidance

Depends

This bot is usually safe to allow when the request source is verified and the traffic matches your site policy.

Yahoo! JAPAN J-DLC is used for search indexing, URL discovery, page rendering, result freshness, and search-quality checks.

Record Details

Structured data
Operator
Yahoo! JAPAN
Family
Yahoo! JAPAN
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 J-DLC by matching `J-DLC` to Yahoo! JAPAN evidence, then checking reverse DNS, source-network ownership, signed request data, or published crawler documentation when available.
Spoofing risk
Yahoo! JAPAN J-DLC has medium spoofing risk because user-agent strings can be copied; pair the match with DNS, IP, behavior, or operator evidence.

Notes

  • Yahoo! JAPAN J-DLC is a search crawler from Yahoo! JAPAN used for search indexing, URL discovery, page rendering, result freshness, and search-quality checks.
  • Its primary user-agent pattern is J-DLC; related patterns include J-DLC/; a representative HTTP user-agent is Y!J-DLC/1.0 (https://support.yahoo-net.jp/PccSearch/s/article/H000007955).
  • Yahoo! JAPAN J-DLC 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 J-DLC is marked as respecting robots.txt directives for crawler access control.
  • Yahoo! JAPAN J-DLC can usually be allowed after confirming the source and monitoring request volume.

Evidence and Source

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