🤖 Overview

s1z.ru is a web crawler operated by the Russian SEO analytics platform S1Z (s1z.ru), a service specializing in competitive intelligence, backlink monitoring, and website performance analysis. According to its official documentation at s1z.ru/bot, the bot scans publicly accessible web pages to collect data on link structures, keyword density, and page metadata for its clients’ SEO audits. It is a legitimate commercial tool, not affiliated with any threat actor, and is commonly observed crawling e‑commerce, media, and corporate domains.

🌐 Technical Behavior

The s1z.ru crawler originates from IP ranges registered to Moscow‑based hosting providers (e.g., AS197068, AS200350), with requests typically sent at intervals of 2–5 seconds per domain. It uses HTTP/1.1 and supports both IPv4 and IPv6. Crawling follows a breadth‑first pattern, often starting from a seed URL list provided by subscribers. The bot respects Accept-Language and Accept-Encoding headers, and may revisit pages every 24–48 hours during active monitoring campaigns.

📋 robots.txt Compliance

Official documentation states that s1z.ru honors robots.txt directives, including Disallow and Crawl-delay instructions. However, independent tests (e.g., WebmasterWorld reports) note that the bot sometimes disregards Crawl-delay values shorter than 10 seconds, recommending explicit Disallow to block unwanted paths.

🔍 Detection Indicators

The primary User‑Agent string is Mozilla/5.0 (compatible; s1z.ru/1.0; +http://s1z.ru/bot). Additional fingerprints include a default header From: [email protected] and a consistent Accept: text/html,application/xhtml+xml pattern. The bot does not spoof other browsers and always appends a descriptive comment with the version number.

📊 Data Usage

Collected data—such as backlink profiles, page title tags, meta descriptions, and header structures—is aggregated into S1Z’s commercial SEO dashboards. Subscribers use these reports to track competitor link building, identify broken links, and optimise content strategies. No data is used for generative AI training or public redistribution.

⚙️ Rate Limiting Policy

Rate limiting is recommended because the bot’s default crawl frequency (up to 20 requests per minute) can overwhelm small or uncached sites. Administrators should apply threshold‑based blocking (e.g., 60 requests in 10 seconds) to maintain server stability while still allowing legitimate analytics access.

ⓘ 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.