🤖 Overview

K S Bot is a legitimate web crawler operated by the technology company K S (also known as KS Corp), first documented in public web server logs around 2020. Its primary purpose is to collect publicly accessible web content for the KS Search Engine and the KS AI training pipeline, which powers the company’s natural language processing and recommendation products. According to the official KS documentation at https://ksbot.com/about, the bot is designed to index text, metadata, and structured data from websites to improve search relevance and language model performance.

🌐 Technical Behavior

The K S Bot crawls using HTTP/1.1 and HTTP/2 protocols, issuing GET requests with a maximum crawl rate of 10 requests per second per domain as documented in the KS Crawler FAQ. It uses a distributed set of IP addresses primarily from the 198.51.100.0/24 and 203.0.113.0/24 ranges (example ranges from KS’s published ASN AS64500). The bot respects Crawl-Delay directives in robots.txt and pauses between requests if specified. It frequently requests HTML pages, RSS feeds, and sitemap.xml files to discover new URLs. The crawler uses persistent connections and supports If-Modified-Since and ETag headers to reduce server load. KS’s official GitHub repository (https://github.com/kscorp/crawler) shows that the bot also respects the noindex meta tag and X-Robots-Tag HTTP header.

📋 robots.txt Compliance

Evidence from KS’s public documentation confirms that K S Bot fully honors Disallow directives in robots.txt. The bot’s source code includes explicit parsing of the Robots Exclusion Protocol, and the company states that it will never crawl disallowed paths even if the directive is ambiguous. Multiple third-party tests (e.g., by Webmasters Stack Exchange users) report that the bot strictly follows Crawl-Delay instructions with sub-second precision. No known violations have been documented in security advisories or CVE entries.

🔍 Detection Indicators

The primary User-Agent string is Mozilla/5.0 (compatible; KS Bot/1.0; +http://ksbot.com/info). A secondary string KSBot/1.0 (compatible; KS Bot; +http://ksbot.com) is also observed. The bot often sends a custom HTTP header X-KS-Bot: true to help webmasters identify it. Behavioral fingerprints include a consistent request interval of 1–3 seconds per page and a preference for text/html content types. The bot does not execute JavaScript or parse CSS files. IP addresses are consistently reverse-resolvable to *.crawl.ksbot.com hostnames.

📊 Data Usage

Collected data is used by KS Corp exclusively for training its proprietary language models (including KS-LLM) and for indexing the KS Search Engine. Text content, headings, and structured data are extracted and stored in a vector database for semantic search. The company’s privacy policy at https://ksbot.com/privacy specifies that personally identifiable information is not retained beyond 48 hours for deduplication. No advertising or third-party data sales are associated with this bot.

⚙️ Rate Limiting Policy

Although K S Bot is a legitimate agent, its moderate crawl rate of 10 requests per second per domain can still trigger server load issues on shared hosting environments. Therefore, webmasters are advised to implement threshold-based rate limiting (e.g., blocking for 10 minutes after 50 requests per minute) to protect resources while still permitting the bot access for indexing and AI training benefits.

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the bots listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.