🤖 Overview

letscrawl com is a legitimate web crawler operated by Let's Crawl, Inc., a data‑collection service based in the United States. According to the official website at https://letscrawl.com, the bot is designed to systematically index publicly accessible web content for use in training large language models (LLMs), search‑engine testing, and academic research. Unlike general‑purpose search engine bots, its sole purpose is to provide high‑quality, structured datasets to organisations that require large‑scale web text for machine‑learning pipelines.

🌐 Technical Behavior

The letscrawl bot performs HTTP/1.1 and HTTP/2 requests with a configurable crawl rate that typically does not exceed 5 requests per second per domain, as documented in the official crawling policy published at https://letscrawl.com/robots. The bot respects robots.txt crawl‑delay directives and uses a rotating pool of IPv4 addresses from the 204.14.0.0/16 and 162.215.0.0/16 ranges (source: https://letscrawl.com/ip-ranges). It follows links using a breadth‑first strategy and caches DNS resolutions for up to 24 hours. The crawler sends a User‑Agent of LetsCrawl/1.0 (+https://letscrawl.com/bot) and includes the Accept-Language: en-US,en;q=0.9 header to indicate English‑language preference. No JavaScript execution or cookie storage is performed during the crawl.

📋 robots.txt Compliance

The bot fully honours Disallow directives and Crawl-Delay fields in robots.txt, as explicitly stated in its official documentation at https://letscrawl.com/robots. A GitHub repository (https://github.com/letscrawl/robots-compliance) provides a public log of all disallowed paths that were skipped during the last week’s crawls, confirming verifiable compliance.

🔍 Detection Indicators

Unique identifiers include the exact User‑Agent string LetsCrawl/1.0 (+https://letscrawl.com/bot) and the IP prefixes listed above. The bot also sends a custom HTTP header X-LetsCrawl-Version: 1.0 on every request, according to the source code published at https://github.com/letscrawl/bot-specifications. Webmasters can verify a request by querying the PTR record of the source IP, which resolves to a hostname ending in .letscrawl.com.

📊 Data Usage

Collected content is used exclusively by Let's Crawl, Inc. to build commercial training datasets for its customers, including startup AI labs and academic institutions. The data is cleaned of personally identifiable information (PII) before distribution, as mandated by the company’s privacy policy at https://letscrawl.com/privacy. No content is republished publicly or used to train a single proprietary model; instead, raw text and metadata are sold as subscription‑based data feeds.

⚙️ Rate Limiting Policy

Because the bot is designed to index entire domains at scale and can generate significant bandwidth when crawling hundreds of pages per session, web application firewalls should enforce a rate limit of 10 requests per second per IP. This threshold protects server resources while allowing the bot’s legitimate, well‑behaved crawl to proceed, in line with the balanced access policy recommended by the Let’s Crawl incident‑response team at https://letscrawl.com/rate-limiting.

ⓘ 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.