Websites Blocking crawler4j

Site Stats Database currently tracks 1,426 websites that block crawler4j. We detect this by analyzing each site's homepage, response headers, and DNS, then enrich every record with traffic and authority data.

By number of sites, crawler4j is #224 of 10,135 blocked crawlers & bots that Site Stats Database tracks.

The most common topics among them are News, Sports, and Entertainment, and they are most common in United States and Spain. The breakdowns above show the full split, based on the 1,426 we track.

They tend to have stronger authority than the typical website: the median crawler4j site has an Ahrefs Domain Rating of 35, higher than the 28 median across all sites Site Stats Database tracks.

Over the last 2 months, the number we track grew 53% and their combined traffic rose 2.4%, based on Site Stats Database's month-by-month snapshots of this group.

Traffic estimates, organic keywords, and authority come from DataForSEO; Domain Rating comes from Ahrefs' public endpoint; and the topic, market, and tech detections come from Site Stats Database's own crawler, which inspects each site's HTML, headers, DNS, and TLS certificate.

At least monthly. Traffic and rankings refresh every month, and detections refresh as sites are re-crawled, so this page always reflects the current 1,426 websites that block crawler4j.

Yes. The complete, filterable list of all 1,426 websites that block crawler4j, enriched with traffic history, authority, keywords, and the full tech stack, is available with a Site Stats Database plan.