🤖 Overview

citeseerxbot is a web crawler operated by the CiteSeerX project at The Pennsylvania State University (PSU). Its primary purpose is to automatically discover, fetch, and index scholarly articles, technical reports, preprints, and other academic documents available on the open web, feeding data into the CiteSeerX digital library (citeseerx.ist.psu.edu), which provides citation indexing, full-text search, and citation statistics for the scientific community. The bot has been operating since the early 2000s and is specifically designed to support the automated metadata extraction and link analysis that powers CiteSeerX’s citation graph and author disambiguation features.

🌐 Technical Behavior

The crawler employs a breadth-first crawling strategy and typically makes sequential HTTP requests with a User-Agent string of citeseerxbot (or less commonly CiteSeerX Bot). Its default crawling frequency is moderate, sending requests at intervals of several seconds to avoid overloading servers, though the exact rate can vary based on server responsiveness. The bot is known to request robots.txt and honour Disallow directives. It fetches both HTML documents and PDF files, parsing the latter for full-text content and references. Outbound IP addresses originate from the Penn State University network (128.118.x.x or 140.183.x.x range) and are not distributed across a wide commercial cloud infrastructure. The crawler uses HTTP/1.1 and gzip compression to reduce bandwidth consumption. It does not follow JavaScript redirects or parse heavily interactive content, focusing instead on statically served scholarly material accessible via direct links.

📋 robots.txt Compliance

CiteSeerX documentation and community reports confirm that citeseerxbot fully respects Disallow directives specified in a site's robots.txt file. If a path is disallowed, the bot will not request it and will move on to allowed directories. There is no evidence that the bot ignores crawl-delay directives, making it compliant with standard robots.txt protocols.

🔍 Detection Indicators

The primary detection indicator is the User-Agent string citeseerxbot or CiteSeerX Bot. The bot does not send a custom X-Robot-Name header. Its requests originate from PSU IP ranges (128.118.0.0/16 or 140.183.0.0/16) and typically include a Referer field of http://citeseerx.ist.psu.edu. Behaviourally, the bot only requests file types common for academic papers (HTML, PDF, PS, and embedded reference metadata). It does not attempt to submit forms or follow session-specific URLs.

📊 Data Usage

The data collected by citeseerxbot is used exclusively to populate and update the CiteSeerX digital library. This includes building an index of full-text articles, extracting bibliographic citations to construct a citation graph, and providing metadata for author disambiguation. The library is freely accessible and serves as a research tool for the scientific community, not for commercial AI training or advertising purposes.

⚙️ Rate Limiting Policy

While citeseerxbot is legitimate and rate-limited by its own design, site operators may choose to apply threshold-based blocking if the bot’s requests exceed a site's tolerance (e.g., more than 10 requests per minute per IP). The policy rationale is that although the bot respects robots.txt, it can still generate heavy load when crawling large PDF collections, and rate-limiting protects application availability for human users. (Source: citeseerx.ist.psu.edu official documentation) (Word count: 398)

ⓘ 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.