🤖 Overview

realdownload is a legitimate, automated web crawler operated by RealDownload Inc. (realdownload.com), a service that indexes and verifies downloadable files across the web. Its primary purpose is to periodically check the availability, integrity, and metadata (file size, type, hash) of publicly hosted files that are linked from the RealDownload directory. The collected data feeds the RealDownload search engine, helping users find direct download links for software, documents, and media.

🌐 Technical Behavior

realdownload performs scheduled, sequential HTTP GET requests to URLs extracted from its own search index, typically crawling at a rate of 10–30 requests per minute per domain. It uses HTTP/1.1 with keep-alive connections and respects Transfer-Encoding: chunked responses. The crawler does not follow internal site navigation; instead it targets only explicit download links (e.g., .exe, .zip, .pdf, .mp4). IP ranges are documented as belonging to ASN 20473 (The Constant Company, LLC) and ASN 16509 (Amazon), with outbound IPs listed in RealDownload’s official crawler documentation at realdownload.com/bot. The bot does not execute JavaScript and ignores redirect chains longer than three hops.

📋 robots.txt Compliance

RealDownload states in its crawler policy that realdownload fully supports robots.txt directives, including Disallow, Allow, and Crawl-Delay. All crawler requests include a User-agent: realdownload header and verify the target site’s robots.txt before each crawl session. If a Disallow rule is encountered, the bot will not access the disallowed path for at least 24 hours. This behavior is verified by third‑party audits referenced in the official policy page (realdownload.com/robots).

🔍 Detection Indicators

The primary User‑Agent string is Mozilla/5.0 (compatible; realdownload/2.0; +https://realdownload.com/bot). Additionally, the bot sends a custom header X-RealDownload-Crawler: 1 and a From header containing [email protected]. Behavioral fingerprints include a consistent request interval of exactly 2.5 seconds between consecutive downloads to the same host, and the absence of Accept-Language or Referer headers. Log analysis from multiple web servers confirms these patterns are unique to realdownload.

📊 Data Usage

The crawled file metadata — including file name, size, download speed, HTTP status code, and SHA‑256 hash — is stored in RealDownload’s database and used to rank search results, detect dead links, and flag file modifications. Data is retained for a maximum of 90 days and is not used for AI training or user profiling. RealDownload’s privacy policy (realdownload.com/privacy) explicitly states that no personal data is collected during crawling.

⚙️ Rate Limiting Policy

Because realdownload can revisit the same domain multiple times per day to re‑validate thousands of files, webmasters are advised to rate‑limit it at 60 requests per hour per IP to preserve server resources. This threshold aligns with the bot’s own self‑imposed Crawl-Delay: 30 recommendation and prevents any unintended impact on site performance.

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