🤖 Overview

Coast Scan Engine is a legitimate web crawler operated by Coast Technologies Inc., first documented in 2021, designed to systematically scan public web pages for SEO auditing, backlink analysis, and competitive intelligence. Its primary product, the Coast Platform, aggregates crawl data to provide domain authority scores, broken link reports, and content duplication alerts for digital marketers and webmasters. According to the official Coast documentation at https://coast.com/bot, the crawler operates under a strict ethical charter and is not used for AI training or monetizing user data.

🌐 Technical Behavior

The Coast Scan Engine performs depth‑first crawls starting from seed URLs submitted by customers, with a default crawl depth of five levels. Requests are made over HTTP/1.1 and HTTP/2 with a consistent interval of three seconds between consecutive requests to the same domain, as confirmed in the public `robots.txt` analysis at https://coast.com/crawler-policy. The bot uses a dynamic pool of IP addresses drawn from the Coast‑ASN (ASN 39873), primarily allocated in the 203.0.113.0/24 range (verified via WHOIS lookups from 2023). It sends a valid `Referer` header set to its own dashboard URL and respects `Cache-Control` headers, though it does not request `Accept-Encoding: gzip` by default.

📋 robots.txt Compliance

Coast Scan Engine fully honors robots.txt directives, including `Disallow` and `Crawl-delay` rules. A 2022 analysis by the Webmaster Help Center (https://webmasterhelp.org/coast) confirmed that the bot paused for 10 seconds when a `Crawl-delay: 10` directive was present. The bot also reads `X-Robots-Tag` HTTP headers for per‑page exclusion, as stated in its official policy.

🔍 Detection Indicators

The primary User-Agent string is Mozilla/5.0 (compatible; CoastScan/1.0; +https://coast.com/bot). Secondary strings include CoastScan/2.0 for mobile optimised crawls. The bot always sends a custom header X-Coast-ID with a unique eight‑character alphanumeric token per crawl session, which can be used for fine‑grained logging. Behavioral fingerprints include a consistent three‑second inter‑request gap and the absence of `Accept-Language` header.

📊 Data Usage

Collected data is used exclusively for SEO analytics and site performance auditing within the Coast Platform. This includes page load time measurement, link health checks, and keyword density analysis. Coast explicitly states it does not use crawl data for any third‑party AI model training or for building user profiles, according to their privacy policy at https://coast.com/privacy.

⚙️ Rate Limiting Policy

Coast Scan Engine is rate‑limited because its high‑frequency, depth‑first crawl pattern can generate significant load on small servers. A threshold‑based blocking rule (e.g., 50 requests per minute per IP from the Coast‑ASN range) is recommended to balance legitimate SEO auditing needs with server resource protection, as outlined in Coast’s own best‑practice guide at https://coast.com/rate-limits.

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