🤖 Overview

The accmonitor compliance server is a web crawler operated by AccMonitor LLC (https://www.accmonitor.com), a specialized firm providing automated compliance auditing for web accessibility standards such as WCAG 2.1 and ADA Title III. First publicly documented in 2016, its primary purpose is to scan websites for accessibility barriers, generating detailed reports for clients under legal or internal policy obligations. The bot feeds data directly into the AccMonitor Compliance Dashboard, a SaaS platform used by organizations to track and remediate accessibility violations.

🌐 Technical Behavior

The crawler employs a headless Chromium-based engine to render JavaScript‑heavy pages and simulate assistive technology interactions, such as keyboard navigation and screen‑reader parsing. It uses HTTP/1.1 and HTTPS exclusively, with a typical request rate of 1–3 requests per second per domain, and limits concurrent connections to two. IP addresses originate from the public range 216.145.0.0/20 (ASN 38266) as documented in the official AccMonitor crawler FAQ. The bot sends a User-Agent string of AccMonitor/2.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0; +https://www.accmonitor.com/crawler) and includes a From header with the client’s email address when configured. It performs full‑page scans including CSS, images, and scripts, but does not interact with forms or submit data.

📋 robots.txt Compliance

According to the official AccMonitor robot‑exclusion policy, the bot fully honors Disallow directives found in robots.txt. It also respects Crawl-Delay directives, with a default delay of 5 seconds if unspecified. Site owners can test compliance by reviewing the bot’s logs available in the AccMonitor Console.

🔍 Detection Indicators

The primary identifier is the User-Agent string prefix AccMonitor/ followed by a version number. Additionally, the bot sets a unique X-Crawler-Type: accmonitor header in all requests. Reverse DNS lookups for its IPs return hostnames ending in .accmonitor.com. Log entries typically show a consistent pattern of requests for HTML, CSS, and ARIA attributes.

📊 Data Usage

Collected page content—including DOM structure, text alternatives, color contrast values, and ARIA role usage—is stored in the AccMonitor Compliance Dashboard for up to 18 months. This data is used exclusively to generate accessibility scorecards, violation reports, and remediation recommendations for paying subscribers. No data is sold or used for AI training; the company’s privacy policy (updated March 2024) explicitly prohibits non‑compliance purposes.

⚙️ Rate Limiting Policy

Because the crawler can sustain multiple concurrent scans across thousands of pages, rate limiting is applied to prevent server overload. A threshold of 5 requests per second within a 10‑second window is recommended; exceeding this results in a 429 response, after which the bot backs off exponentially for up to 30 minutes. This policy is documented in Section 3.2 of the AccMonitor Crawler Guidelines (available at https://www.accmonitor.com/crawler/guidelines).

ⓘ 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.