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.

User-Agent

J-DLC

User-agent strings are identity signals, not proof of identity. Confirm the source and behavior before trusting a request.

Verification and Detection

Verification method: 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.

Handling Guidance

This bot is usually safe to allow when the request source is verified and its behavior matches the operator documentation and your site policy.

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

Record Details

Aliases: J DLC/
Type: search
Operator: Yahoo! JAPAN
Family: Yahoo! JAPAN
Kind: Crawler
Purpose: Indexing
Identity: Verified Bot
Detection confidence: Medium
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.
Status: Active
Respects robots.txt: Yes
Last verified: 2026 06 23

Robots.txt Snippet

User-agent: J-DLC
Disallow: /