🤖 Overview

visweb is a legitimate web crawler operated by Visualping, a company specializing in website change detection and monitoring services. According to Visualping's official documentation, the visweb bot is used to systematically crawl web pages on behalf of users who subscribe to Visualping's monitoring plans, enabling the service to detect and alert subscribers to modifications in specific page elements, content, or entire web pages. The crawler is an integral part of Visualping's product suite, which includes both free and paid tiers for tracking changes on public websites, competitor pages, and regulatory compliance documents.

🌐 Technical Behavior

The visweb bot uses standard HTTP/HTTPS requests with a crawl pattern that respects typical web standards. Based on user reports and the Visualping knowledge base, the crawler sends requests at intervals configurable by the user, ranging from every 5 minutes on premium plans to every 24 hours on free plans. Visualping has not publicly released a fixed list of IP ranges, but traffic analysis from web server logs indicates the crawler originates from cloud infrastructure providers such as AWS, Google Cloud, and possibly DigitalOcean. The bot fetches both the HTML content and linked resources (CSS, JavaScript, images) to render a full page snapshot for comparison. It uses HTTP headers including Accept-Language and Accept-Encoding, and may follow redirects but does not submit forms or execute JavaScript beyond initial page load. Rate of requests per domain is generally low to moderate, as each crawl is triggered per user's monitor, not as a bulk crawl of an entire site.

📋 robots.txt Compliance

Visualping explicitly states in their official FAQ that the visweb crawler honors the robots.txt directives of each website it visits. The crawler will not access any URL path that is disallowed by the site owner's robots.txt file. However, Visualping notes that if a user creates a monitor for a disallowed page, the service will display an error instead of bypassing the rules. This policy is documented on Visualping's support page under "How does Visualping respect robots.txt?" and has been confirmed by multiple independent webmaster forum posts.

🔍 Detection Indicators

The primary detection indicator is the User-Agent string: visweb (often seen as Mozilla/5.0 (compatible; visweb/1.0; +https://visualping.io/help/visweb)). The bot may also include a From: header with a support email address ([email protected]) and a via: header referencing Visualping's infrastructure. Another fingerprint is the consistent use of Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8. The crawler sends requests at relatively regular intervals based on the user's monitor schedule, making it distinguishable from typical organic traffic. No CVE entries specific to visweb exist, as it is not associated with vulnerabilities.

📊 Data Usage

Collected data is used exclusively for Visualping's change detection service: the bot downloads page snapshots, computes a perceptual hash or diff of the HTML/text, and stores the latest version to compare against future crawls. Visualping does not use the data for external AI training, search indexing, or resale. According to their privacy policy, page content is retained only as long as necessary for the monitor's operation and is not shared with third parties except for infrastructure hosting.

⚙️ Rate Limiting Policy

Given that visweb can generate repeated requests to the same page (up to every 5 minutes), it is often rate-limited by webmasters to prevent excessive load on server resources. The policy rationale for threshold-based blocking is that while the bot is legitimate and cooperative with robots.txt, its periodic polling can still strain small servers or trigger false alarms in monitoring systems; limiting consecutive requests from the same IP or requiring CAPTCHA after a certain frequency is a standard defensive measure.

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