Websites Powered by mod_jk
12,294 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 5,325 mod_jk sites with Chrome UX data, p75 values, Oct 2026.
Top countries
South Korea
2,036
United States
1,537
Italy
1,014
India
887
Spain
770
Japan
732
Germany
712
Canada
696
Sites using mod_jk by audience country, Chrome UX Report.
Usage by industry
| Industry | Share | Websites |
|---|---|---|
| Government | 0.10% | 9 |
| Education | 0.05% | 34 |
| Arts and entertainment | 0.02% | 11 |
| Finance and insurance | 0.02% | 4 |
| Retail | 0.01% | 42 |
| Travel and hospitality | 0.01% | 9 |
| Sports and fitness | <0.01% | 2 |
| Healthcare | <0.01% | 8 |
| Professional services | <0.01% | 3 |
| Software and apps | <0.01% | 8 |
| News and media | <0.01% | 2 |
| Beauty and wellness | <0.01% | 1 |
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
No sites to list from recent crawls.