OpenCitations HTTP Access Logs, January–April 2026

HTTP access logs from OpenCitations servers, January through April 2026. These are the raw requests as seen by the reverse proxy, i.e. every hit to the website, REST API, and SPARQL endpoint. Each CSV row is one request, with columns: hashed_ip (SHA-1+salt of client IP), continent_name, country_iso_code, country_name, request_method, request_host, request_path, http_response_code, user_agent, token, date (ISO 8601), referer. Client IPs were hashed for privacy before export. The archive holds four monthly files, oc-2026-01.csv through oc-2026-04.csv, totalling 182 million rows and roughly 43 GB uncompressed. Extract with: tar -xzf opencitations-access-logs-2026-jan-apr.tar.gz On Windows, 7-Zip or WSL will do the job. You get four plain CSV files.