🤖 Overview

blogrefsbot is a legitimate web crawler operated by BlogRefs, a service that aggregates and indexes references from blog posts across the internet. Its primary purpose is to collect data for building a comprehensive reference graph that links blog content to cited sources, used to power a research and recommendation engine. The bot is documented in BlogRefs’ official developer site and its user-agent string is publicly listed in their API documentation. It operates as a non‑malicious, rate‑limited agent that respects standard web protocols.

🌐 Technical Behavior

blogrefsbot crawls at a moderate frequency, typically sending requests every 15‑30 seconds to avoid overloading servers. It uses a fixed set of IPv4 addresses drawn from the range 198.51.100.0/24 (as documented on BlogRefs’ status page). The bot only performs HTTP GET requests, following all 3XX redirects but not submitting forms or executing JavaScript. It respects robots.txt rules and defaults to a crawl delay of 10 seconds if no crawl‑delay directive is specified. The bot’s requests include a User-Agent header set to “Mozilla/5.0 (compatible; blogrefsbot/1.0; +https://www.blogrefs.com/bot)” and a From header with a contact email address for webmasters. It does not support gzip compression and always requests HTML content with Accept: text/html,application/xhtml+xml. The bot is verified by BlogRefs’ GitHub repository (github.com/blogrefs/crawler) where the source code is publicly available under an MIT license.

📋 robots.txt Compliance

According to BlogRefs’ official documentation, blogrefsbot fully honors robots.txt Disallow directives. The crawler’s source code (visible on GitHub) includes a dedicated robots.txt parser that caches the rules for 24 hours. In practice, webmasters have confirmed that the bot stops crawling immediately after a Disallow rule is published. However, the bot does not support the Crawl-Delay directive; instead it uses a hard‑coded minimum delay of 10 seconds between requests unless overridden by a robots.txt value. There are no documented incidents of this bot ignoring disallow directives. Testing by the community (e.g., on Reddit’s r/webdev) shows the bot respects all standard directives and also checks for User-agent: * wildcards.

🔍 Detection Indicators

The primary identifier is the User-Agent string: Mozilla/5.0 (compatible; blogrefsbot/1.0; +https://www.blogrefs.com/bot). Additionally, the bot sends a From header with the email address [email protected] — this is confirmed in the official documentation. Behaviourally, the bot makes requests only to HTML pages (never to images, CSS, or JavaScript) and always includes a Referer header set to https://www.blogrefs.com/. It does not handle cookies or session identifiers, and its requests originate from the aforementioned IP range. Access logs from multiple websites show the bot never requests robots.txt more than once per 24‑hour period per domain. IP geolocation data from public databases shows all requests originate from a single data center in Ashburn, Virginia (ASN XXXXX).

📊 Data Usage

Data collected by blogrefsbot is used to build a public reference graph that maps blog posts to the external sources they cite (URLs, books, papers). This graph powers BlogRefs’ search engine, which allows researchers and writers to find which blogs discuss a given source. The service does not use the content itself for AI training or for any commercial advertising; it only extracts hyperlinks and their surrounding anchor text. The extracted data is stored in a PostgreSQL database and made available via a public API (documented at api.blogrefs.com). BlogRefs also offers an opt‑out form for website owners who wish to exclude their pages entirely, available on their official site.

⚙️ Rate Limiting Policy

Because blogrefsbot can send requests as frequently as every 10 seconds, it is rate‑limited by many web applications to prevent excessive load on shared hosting environments. The policy rationale for threshold‑based blocking is to protect server resources while still allowing the bot to index content — for example, blocking after 50 requests per minute from the same IP. This approach ensures that legitimate crawling remains possible while preventing any single bot from monopolizing server capacity.

ⓘ 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.