Websites Powered by mod_jk

12,360 websites tracked using mod_jk (Web server extensions) · tomcat.apache.org

mod_jk is a web-server extension or module. Its official site is tomcat.apache.org. PoweredBy tracks the websites that use mod_jk across the public web; the tracked counts, adoption trend, and site list on this page are updated from our ongoing crawl of the web server extensions ecosystem.

Usage trend

Core Web Vitals

Median site among 5,473 mod_jk sites with Chrome UX data, p75 values, Sep 2026.

Top countries

South Korea 2,059

United States 1,618

Italy 1,027

India 936

Spain 768

Germany 724

Japan 711

Canada 707

Sites using mod_jk by audience country, Chrome UX Report.

Usage by industry

Share of each industry's websites with a detected stack that use mod_jk; industries come from what sites declare in their own structured data.

Top sites by authority

The share of the web's most authoritative domains, by Open Page Rank tier, seen running mod_jk in recent crawls. Only 372 domains worldwide score 9 or higher.

Websites using mod_jk

Open Page Rank is the domain's authority score (0 to 10, from the open web link graph); the list is ordered by it and covers sites seen in recent crawls. Visits and keywords are estimated US organic search figures.

Download top 10,000 as CSV (zip) →

Columns: domain, Open Page Rank, first seen, last seen, industry (from the site's own structured data, blank when none).

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