🤖 Overview

SearchHippo.com is a web crawler operated by the independent search engine project SearchHippo, which launched around 2018 and is maintained by a small team focused on providing an alternative search experience with an emphasis on privacy and minimal data collection. The bot systematically indexes publicly accessible web pages to populate the SearchHippo search index, which is then used to return organic search results to end users. According to the project’s official website (searchhippo.com), the crawler is designed to be efficient and respectful of server resources while enabling comprehensive coverage of the web.

🌐 Technical Behavior

The SearchHippo crawler employs a breadth-first traversal strategy, typically starting from submitted URLs or sitemaps, and follows HTTP and HTTPS links while respecting meta tags such as nofollow and noindex. Its request frequency is variable but can be aggressive during initial crawls—documented in community forums and the crawler’s own FAQ—with a default maximum crawl rate of 10 requests per second per domain, though this may be reduced upon encountering slow responses or rate limiting headers. The bot uses IPv4 addresses drawn from a published IP range list available at the SearchHippo website; these are typically hosted on cloud infrastructure such as DigitalOcean and Hetzner, with blocks like 209.145.0.0/17 and 5.101.0.0/19 reported in server logs. It sends a standard User-Agent string and includes a From email header pointing to the maintainer’s contact address, as confirmed by the project’s GitHub repository (github.com/searchhippocrawler). The bot also supports HTTP/1.1 and HTTP/2 protocols, and caches DNS lookups to reduce latency.

📋 robots.txt Compliance

SearchHippo’s crawler is documented as fully compliant with the Robots Exclusion Standard (robots.txt) per its own policy page. It reads the robots.txt file before each crawl of a new domain and strictly obeys Disallow directives, including wildcard patterns. Additionally, it checks for Crawl-Delay instructions and pauses accordingly. This compliance has been verified by third-party security blogs (e.g., SearchEngineLand) and by the project’s open-source codebase on GitHub, which includes a dedicated robots.txt parser module.

🔍 Detection Indicators

The primary identifying User-Agent string is Mozilla/5.0 (compatible; SearchHippo/1.0; +https://searchhippo.com/bot.html). Secondary strings may include a simplified version like SearchHippo/1.0. The bot also sets a custom HTTP header X-Crawler: SearchHippo, and its requests typically originate from the IP ranges mentioned above. Behavioral fingerprints include a consistent crawl pattern of fetching robots.txt first, then prioritized sitemap files, and a distinct interval between successive requests that respects the server’s response time.

📊 Data Usage

Collected data is used exclusively for building and refining the SearchHippo search index. The bot captures page titles, meta descriptions, content text, and links, but explicitly states it does not store personal data, images, or non-public content. All crawled data is stored on encrypted servers and is not shared with third parties; the index is periodically rebuilt to remove stale or removed pages, as detailed in the project’s privacy policy.

⚙️ Rate Limiting Policy

Rate limiting is recommended for this bot because, while legitimate, it can generate a high volume of requests during initial indexation phases that may strain small or under-provisioned servers. A threshold-based blocking policy—such as limiting to 5 requests per second per IP or implementing a dynamic backoff strategy—ensures fair resource allocation without blocking the bot outright, as it is a beneficial crawler for SEO and visibility.

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