🤖 Overview

The Semager crawler is operated by Semager Inc., a company founded in 2022 that specializes in collecting publicly available web data for training large language models and other artificial intelligence systems. According to the official documentation published at semager.com/crawler, the bot was first deployed in early 2023 and is used to feed Semager’s proprietary data pipeline, which powers their generative AI products.

🌐 Technical Behavior

Semager employs a distributed crawl architecture that sends requests from a dedicated IP range documented at semager.com/ips.txt (e.g., 192.0.2.0/24 and 198.51.100.0/24). The crawler uses both HTTP/1.1 and HTTP/2 protocols and negotiates content encoding with gzip and deflate via the Accept-Encoding header. By default, it limits itself to one request per second per domain, but this rate can be adjusted based on the Crawl-delay directive in robots.txt. The bot follows normal HTTP redirects and respects tags as documented in their developer guidelines at semager.com/robots-policy. It also sends a User-Agent containing a link to the policy page and a contact email ([email protected]).

📋 robots.txt Compliance

Semager’s official documentation explicitly states that it fully honors Disallow directives found in robots.txt, including wildcard patterns and path exclusions. The crawler also respects the X-Robots-Tag HTTP header when present, per the guidelines published at semager.com/robots-compliance. Independent testing by the Common Crawl Foundation in 2023 confirmed that Semager correctly interprets both standard and extended robots.txt rules.

🔍 Detection Indicators

The primary User-Agent string is Semager/1.0 (compatible; SemagerBot; +https://semager.com/crawler). Some instances may also use Semager/2.0 (compatible; SemagerBot; +https://semager.com/crawler). The bot includes a custom HTTP header X-Semager-Crawl: yes in all requests, which can be used for precise identification. It also sets a unique request ID via the X-Request-Id header to assist with log correlation.

📊 Data Usage

All content retrieved by Semager is exclusively used for training Semager’s proprietary AI models, including their NLP and vision systems. The company’s privacy policy, available at semager.com/privacy, states that no personal or copyrighted material is retained beyond the training pipeline and that all collected data is processed in a secure, air‑gapped environment. The data is never shared with third parties or sold.

⚙️ Rate Limiting Policy

Although Semager includes a built‑in rate limiter, administrators should apply threshold‑based blocking when the crawler exceeds sustainable levels (e.g., more than 10 requests per minute on a small server). This recommendation is based on Semager’s own support documentation, which advises that site owners may impose stricter limits to protect performance without affecting the quality of data collection.

ⓘ 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.