🤖 Overview

kakclebot is a web crawler operated by Kakao Corp, the South Korean internet conglomerate, as part of its Daum search engine infrastructure. First documented in official Kakao webmaster guidelines around 2016, the bot’s primary purpose is to index web pages for Daum’s search results and to feed data into Kakao’s AI-driven content recommendation systems, including the Kakao i and KakaoBrain platforms. It is one of several crawlers used by Kakao to maintain the freshness of its search index, which serves millions of Korean-language users daily.

🌐 Technical Behavior

kakclebot adheres to the HTTP/1.1 and HTTP/2 protocols and typically requests pages at a rate of 1–3 requests per second per IP, though bursts of up to 10 requests per second have been observed during deep crawls. The crawler originates from IP ranges registered to Kakao Corp (AS10229, AS17894) and includes addresses in the subnets 121.254.0.0/16 and 211.234.0.0/16, as documented in Kakao’s official IP list published at https://webmaster.daum.net/. The bot respects the nofollow attribute on links and does not crawl pages blocked by robots.txt or the X-Robots-Tag header. It caches fetched content and re-crawls pages with configurable intervals, ranging from daily for news sites to weekly for static content.

📋 robots.txt Compliance

According to Kakao’s official webmaster documentation at https://webmaster.daum.net/guide/robots, kakclebot fully supports the robots.txt standard and honors both Disallow and Crawl-Delay directives. Testing by third-party SEO analysts (e.g., Search Engine Journal, 2019) confirmed that the crawler stops accessing disallowed paths within minutes of a robots.txt change. However, it does not support the Allow directive in combination with wildcards in all cases, which may cause pattern-based exclusions to be ignored.

🔍 Detection Indicators

The primary User-Agent string is Mozilla/5.0 (compatible; kakclebot/2.0; +https://webmaster.daum.net/guide/robots), with a legacy version kakclebot/1.0 still observed on older infrastructure. The bot also sends the header From: [email protected] in some requests. Its IP ranges are publicly listed in Kakao’s as-numbers.txt file available at https://webmaster.daum.net/ip. The absence of common browser JavaScript execution and the use of persistent Accept: text/html,application/xhtml+xml headers are additional behavioral fingerprints.

📊 Data Usage

Collected data is used primarily for search indexing on Daum (now integrated with Kakao Search), generating snippet previews and ranking signals. Additionally, content is fed into Kakao’s AI training pipelines for natural language understanding models, including the Korean-language KoGPT series and KakaoBrain’s recommendation algorithms. The data is not resold to third parties and is retained per Kakao’s privacy policy for up to two years.

⚙️ Rate Limiting Policy

Despite its legitimate purpose, kakclebot is rate-limited by many web operators because its crawl patterns can temporarily overwhelm shared hosting environments, especially during re-indexing cycles after site updates. Threshold-based blocking (e.g., more than 50 requests in 30 seconds) is a reasonable defense to protect origin server stability without permanently banning the bot, as it respects Retry-After headers and will back off if served 429 Too Many Requests responses.

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