🤖 Overview

cowbot is a web crawler operated by Cow Analytics Inc., a data analytics company established in 2021, as documented on their official website cowbot.io. Its purpose is to harvest publicly available web pages for training large language models used in consumer-facing AI applications. The crawler was first detected in early 2022 and has since been observed globally.

🌐 Technical Behavior

cowbot runs on a cluster of AWS EC2 instances, sourcing IP addresses from the 52.0.0.0/8 and 54.0.0.0/8 blocks, typical for Amazon's cloud. It sends HTTP requests at a median rate of 15 requests per second per source IP, with peaks reaching 60 requests per second during mass indexing. The bot uses HTTP/1.1 with Keep-Alive and follows redirects to HTTPS. It degrades its crawl rate when encountering HTTP 429 or 503 responses, as per its developer guidelines. It also parses sitemaps and respects the Last-Modified header to avoid re-crawling unchanged pages. The crawler supports both IPv4 and IPv6 connections.

📋 robots.txt Compliance

cowbot strictly adheres to robots.txt rules, including the Crawl-delay directive, as stated in its official documentation at cowbot.io/robots. It reads the file at the root of each domain and abides by all Disallow entries. It also supports the X-Robots-Tag and meta robots directives, as verified by independent testing reported in several security blogs.

🔍 Detection Indicators

The primary User-Agent string is Mozilla/5.0 (compatible; Cowbot/1.0; +https://cowbot.io/bot). Variations include Cowbot/1.1 and Cowbot-Spider/1.0. Additionally, the bot includes a custom HTTP header X-Cow-Analytics: true. Its requests originate from dynamic IPs within the mentioned AWS ranges, with reverse DNS entries pointing to ec2.amazonaws.com.

📊 Data Usage

Collected data is processed and used solely for Cow Analytics' internal AI model training, including language modeling and sentiment analysis. It is not shared with third parties or used for advertisement targeting. Data is stored in encrypted form for up to 12 months, after which it is aggregated or deleted, per their privacy policy.

⚙️ Rate Limiting Policy

A rate limit of 50 requests per minute per IP is recommended to prevent server overload while allowing legitimate crawling. The bot is not malicious but can be aggressive in its peaks, hence threshold-based blocking is justified to maintain site performance.

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