🤖 Overview

Html Link Validator is a legitimate web crawler commonly operated by site owners and SEO tool providers (e.g., W3C Link Checker, Dr. Link Check, or Screaming Frog SEO Spider) to programmatically scan websites and verify the integrity of hyperlinks (HTTP status codes, broken anchors, redirect chains). It aggregates link health data into reports used for webmaster maintenance rather than search indexing or AI training.

🌐 Technical Behavior

This bot typically issues HTTP HEAD requests before falling back to GET to minimise bandwidth impact, following a configurable delay between requests (often 1–5 seconds per domain). IP ranges vary widely by operator—open-source tools like W3C Link Checker use the client’s own IP, while commercial crawlers (e.g., Screaming Frog) may run from cloud provider ranges (AWS, DigitalOcean). It crawls at a moderate speed, respecting robots.txt and nofollow attributes, and terminates upon encountering too many successive 4xx/5xx errors.

📋 robots.txt Compliance

Official documentation from both the W3C Link Checker (w3.org/Help) and Screaming Frog SEO Spider (screamingfrog.co.uk/seo-spider) confirm that these tools honour Disallow directives by default, though users can override via custom configuration. The bot pauses crawling when a rate-limit response (429 or 503) is received.

🔍 Detection Indicators

Common User-Agent strings include W3C_Validator/1.3, Screaming Frog SEO Spider/X.Y, and Mozilla/5.0 (compatible; LinkChecker/2.0). Behavioral fingerprints: sequential HEAD requests to every page’s anchor tags, no cookie persistence, and a low request burst pattern followed by long idle windows. Many implementations include a Link-Checker or Validator header.

📊 Data Usage

Collected data (HTTP status codes, redirect destinations, anchor text) is used exclusively for website maintenance—broken link detection, internal linking audits, and redirect chain optimization. No content is stored or transmitted to third parties; results are typically delivered as local CSV/HTML reports or emailed to the website owner.

⚙️ Rate Limiting Policy

Rate limiting is applied because unchecked link validators can generate thousands of requests on deep sitemaps, potentially degrading server performance for real users. A threshold of 50 requests per minute per IP is typical, with a 301 redirect to a captcha page upon violation.

ⓘ 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.