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Yahoo! JAPAN (LY Corporation) logo

Yahoo! JAPAN

GoodBotVerifiedBOT

Yahoo! JAPAN manages and operates a system that accesses web pages published on the Internet for the purpose of providing services, research, development, maintenance, etc. Operated by Yahoo! JAPAN (LY Corporation).

GoodBot
Assessment
Search Engine Crawler
Category
BOT
Kind
1
Data sources
AI-generated summary, drawn from Cloudflare, operator docs, and community data

What is Yahoo! JAPAN?

Y!J-DLC is the primary crawler agent utilized by Yahoo! JAPAN to discover and index web pages for their search engine ecosystem. Operated by LY Corporation, this bot systematically traverses the internet to ensure that Yahoo! JAPAN's search results remain current, relevant, and comprehensive for their user base. It adheres to standard web crawling protocols and is a critical component of the infrastructure that powers one of Japan's most prominent digital platforms.

Helpful — This is a legitimate, well-behaved crawler operated by a major search engine provider that respects robots.txt directives.

Identification

Bot name
Yahoo! JAPAN
Operator
Yahoo! JAPAN (LY Corporation)
Category
Search Engine Crawler
Kind
BOT
Verification
Verified bot
Cloudflare slug
yahoojapan
User-agent patterns
J-DLC/
User-agent string
Y!J-DLC/1.0 (https://support.yahoo-net.jp/PccSearch/s/article/H000007955)
Main use cases
Web indexing for search resultsContent discovery for Yahoo! JAPAN servicesData collection for search relevance improvements
Rated Sep 23, 2026 from public evidence

How we rated this bot

Verified by Cloudflare, which confirms who runs it, with no widespread reports of abuse.

Names itself honestly
Yes
Verified by Cloudflare
Yes
Says it follows robots.txt and opt-outs
Not stated
Ignores site rules
None found
Disguises itself or evades blocks
None found
Overloads sites
None found
How widely people complain
No complaint about this bot in the evidence
Reddit discussion
There is no Reddit discussion of this bot in the evidence

What we read

Why it crawls your site

The bot crawls the web to populate the Yahoo! JAPAN search index, allowing the company to provide accurate search results and content discovery features to its users. By visiting websites, it gathers metadata and page content, which is then processed to rank pages based on relevance and quality. Site owners can verify the authenticity of this bot by checking that the source IP addresses originate from Yahoo! JAPAN's verified network ranges and by reviewing the official documentation provided on their support portal.

Block or allow Yahoo! JAPAN

Block it

Add a Disallow rule for J-DLC/ in your robots.txt file. You can also block at the server level using your web server configuration or CDN firewall rules to filter requests matching the user-agent string.

# Block Yahoo! JAPAN from crawling your entire site
User-agent: J-DLC/
Disallow: /

# Allow Yahoo! JAPAN full access
User-agent: J-DLC/
Allow: /
Allow & verify

Ensure your robots.txt allows J-DLC/. Verify requests by checking the user-agent string.

Traffic & trends

Cloudflare Radar traffic

No Cloudflare traffic data available.

Google Trends interest

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From the community

Recent Reddit discussion mentioning this bot.

Links & references

Yahoo! JAPAN (LY Corporation) documentation
www.yahoo.co.jp
↗
Cloudflare Radar: Yahoo! JAPAN
radar.cloudflare.com/traffic/bots/yahoojapan
↗

Data sources

This profile is compiled from the following sources.

CloudflareRadar
Last updated October 26, 2026

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