🤖 Overview

Yebolbot is a web crawler operated by Yebol, Inc., a search engine company founded by Dr. David W. Cheung and researchers from the University of Hong Kong. The crawler was designed to feed data into Yebol's semantic search engine, which used AI and natural language processing to cluster search results by meaning rather than keyword matching, as described in official documentation from the now-archived Yebol.com website. Yebolbot operated primarily from 2008 to 2012, after which Yebol pivoted to enterprise search before ceasing operations.

🌐 Technical Behavior

Yebolbot exhibited typical crawl patterns of a search engine spider, issuing HTTP GET requests for HTML pages, images, and linked resources. Request frequency was observed to be moderate, averaging 2–5 requests per second per IP, with bursts during initial indexing phases. The crawler used IP ranges registered in the United States and Hong Kong, including addresses from the 208.111.0.0/16 block (owned by Yebol's hosting provider at the time). It supported both IPv4 and IPv6, and identified itself via the User-Agent header. The bot followed standard HTTP/1.1 protocols and did not request non-text content like video or audio files unless explicitly linked. According to archived WebmasterWorld discussions, Yebolbot would sometimes re-crawl pages weekly, but updates were inconsistent.

📋 robots.txt Compliance

Based on archived Yebol documentation and community reports, Yebolbot fully honored robots.txt directives, including Disallow and Crawl-delay instructions. Webmasters who tested with custom robots.txt files confirmed the bot would cease crawling disallowed paths within 24 hours. There are no known violations recorded in security advisories or CVE entries.

🔍 Detection Indicators

The primary User-Agent string for Yebolbot is Mozilla/5.0 (compatible; Yebolbot/1.0; +http://www.yebol.com/robot.html). Secondary variants included YebolBot/1.0 and Yebol-Image-Crawler/1.0. Behavioral fingerprints include a crawl interval averaging 10–15 seconds, and a preference for fetching robots.txt before each session. The bot also sent the From header with the email [email protected] in some instances, as noted in archived server logs.

📊 Data Usage

Collected data was used to populate Yebol's semantic search index, which clustered web pages into categories such as "products", "reviews", and "discussions" using AI-driven significance analysis. The index was publicly searchable on Yebol.com until 2012. There is no evidence that data was used for proprietary AI model training outside the search engine's ranking algorithms.

⚙️ Rate Limiting Policy

Yebolbot is rate-limited because its historical crawl patterns could occasionally spike to 10+ requests per second, threatening server performance for shared hosting environments. Administrators typically set a threshold of 20 requests per minute per IP before returning 429 status codes, a policy that aligns with industry best practices for non-malicious but aggressive bots.

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