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
2K
4K
6K
Apr 2018
Jun 2020
Jul 2022
Sep 2024
Oct 2026
Domains observed using mod_jk in each month's HTTP Archive crawl,
Apr 2018 to Oct 2026 · peak 5,932 in Aug 2022. The tracked total above also
counts sites not re-crawled recently.
Core Web Vitals
LCP 1.3 s
INP 50 ms
CLS 0
TTFB 500 ms
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
9+
2% · 9 of 372 sites
8+
<1% · 72 of 7,677 sites
7+
<1% · 147 of 45,712 sites
6+
<1% · 241 of 110,136 sites
5+
<1% · 323 of 246,751 sites
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
| # | Domain | Open Page RankOPR | Est. monthly visits (US)Visits (US) | Keywords | First seen |
|---|---|---|---|---|---|
| 201 | sapere.it | 6.38/10 | 430 | 1,255 | Jan 2016 |
| 202 | iitj.ac.in | 6.36/10 | 580 | 263 | Jan 2024 |
| 203 | hebis.de | 6.35/10 | - | 27 | Aug 2022 |
| 204 | kasi.re.kr | 6.33/10 | 79 | 31 | Aug 2026 |
| 205 | help.ch | 6.33/10 | - | - | Mar 2024 |
| 206 | utar.edu.my | 6.31/10 | 130 | 186 | Apr 2020 |
| 207 | hs-bremerhaven.de | 6.30/10 | 610 | 63 | Apr 2025 |
| 208 | teleflex.com | 6.29/10 | 18,200 | 3,091 | Aug 2018 |
| 209 | ospedaleniguarda.it | 6.27/10 | 270 | 680 | Apr 2025 |
| 210 | ciando.com | 6.26/10 | 8 | 96 | Jan 2016 |
| 211 | sejong.ac.kr | 6.25/10 | 33 | 8 | Apr 2020 |
| 212 | lamolina.edu.pe | 6.25/10 | 33 | 117 | Aug 2024 |
| 213 | unilab.edu.br | 6.24/10 | 46 | 145 | Aug 2018 |
| 214 | usb.ve | 6.23/10 | 250 | 121 | Aug 2018 |
| 215 | hacc.edu | 6.23/10 | 46,900 | 17,250 | Nov 2017 |
| 216 | comune.prato.it | 6.22/10 | 52 | 163 | Aug 2018 |
| 217 | univasf.edu.br | 6.22/10 | - | - | May 2022 |
| 218 | moet.gov.ae | 6.21/10 | 18,400 | 4,007 | Aug 2025 |
| 219 | ssu.ac.kr | 6.21/10 | 24 | 11 | Aug 2018 |
| 220 | sian.it | 6.20/10 | 91 | 73 | Jul 2026 |
| 221 | allahabadhighcourt.in | 6.20/10 | 4,300 | 5,316 | Apr 2018 |
| 222 | tamagawa.ac.jp | 6.20/10 | 39 | 47 | Sep 2022 |
| 223 | hbk-bs.de | 6.19/10 | 9 | 17 | Jan 2019 |
| 224 | sistemapiemonte.it | 6.18/10 | - | 9 | Jul 2018 |
| 225 | avonworldwide.com | 6.15/10 | 11,200 | 526 | Feb 2019 |
| 226 | teilar.gr | 6.13/10 | 57 | 4 | Jan 2016 |
| 227 | lgensol.com | 6.10/10 | 400 | 149 | Aug 2022 |
| 228 | getafe.es | 6.10/10 | 33 | 175 | Apr 2020 |
| 229 | belem.pa.gov.br | 6.09/10 | 1 | 11 | Aug 2026 |
| 230 | unn.edu.ng | 6.05/10 | 1,700 | 1,408 | Apr 2024 |
| 231 | ub.bw | 6.05/10 | 2,200 | 1,001 | Aug 2022 |
| 232 | natsume.co.jp | 6.05/10 | - | 1 | Oct 2024 |
| 233 | sjc.sp.gov.br | 6.04/10 | 630 | 1,181 | Feb 2020 |
| 234 | pknu.ac.kr | 6.03/10 | 130 | 55 | Oct 2023 |
| 235 | campogrande.ms.gov.br | 6.02/10 | 18 | 56 | Jan 2026 |
| 236 | mohr.gov.my | 6.01/10 | 31 | 86 | Apr 2026 |
| 237 | businesspost.co.kr | 6.01/10 | 27 | 72 | Oct 2017 |
| 238 | tjba.jus.br | 6.01/10 | 310 | 792 | Aug 2018 |
| 239 | iitbbs.ac.in | 6.01/10 | 590 | 1,073 | Nov 2023 |
| 240 | bmtmicro.com | 6.00/10 | 7 | 9 | May 2017 |
| 241 | rsu.ac.th | 6.00/10 | 48 | 16 | Aug 2022 |
| 242 | gnu.ac.kr | 5.98/10 | 220 | 54 | Sep 2020 |
| 243 | gvltec.edu | 5.95/10 | 32,900 | 14,714 | Apr 2019 |
| 244 | sports.or.kr | 5.93/10 | 16 | 29 | May 2017 |
| 245 | saude.go.gov.br | 5.91/10 | - | - | Feb 2019 |
| 246 | crosswire.org | 5.90/10 | 330 | 195 | Jun 2020 |
| 247 | egeaonline.it | 5.89/10 | 7 | 57 | Feb 2021 |
| 248 | ifrj.edu.br | 5.88/10 | 27 | 21 | Feb 2022 |
| 249 | diputaciondeburgos.es | 5.82/10 | - | - | Sep 2021 |
| 250 | mataro.cat | 5.81/10 | 190 | 120 | Jan 2016 |
| 251 | ephhk.com | 5.80/10 | - | - | Aug 2018 |
| 252 | technischeunie.nl | 5.80/10 | 10 | 39 | Feb 2019 |
| 253 | alcobendas.org | 5.74/10 | 140 | 381 | Dec 2025 |
| 254 | unipamplona.edu.co | 5.73/10 | 300 | 846 | Jan 2016 |
| 255 | hidalgo.gob.mx | 5.71/10 | 200 | 240 | Nov 2025 |
| 256 | kbsworld.ne.jp | 5.71/10 | 73 | 98 | Jan 2019 |
| 257 | kunstkamera.ru | 5.70/10 | 350 | 47 | Jun 2016 |
| 258 | nitw.ac.in | 5.70/10 | 890 | 2,641 | Aug 2022 |
| 259 | oabrj.org.br | 5.67/10 | 120 | 143 | Aug 2018 |
| 260 | maceio.al.gov.br | 5.62/10 | 390 | 724 | Oct 2021 |
| 261 | seoultech.ac.kr | 5.61/10 | 60 | 15 | Apr 2022 |
| 262 | tribalpages.com | 5.60/10 | 150 | 51 | May 2018 |
| 263 | comune.cremona.it | 5.60/10 | 97 | 69 | Dec 2022 |
| 264 | sorocaba.sp.gov.br | 5.60/10 | 59 | 87 | Jul 2019 |
| 265 | ulsan.ac.kr | 5.57/10 | - | - | Jul 2022 |
| 266 | uniatlantico.edu.co | 5.56/10 | 430 | 813 | Sep 2021 |
| 267 | mersin.edu.tr | 5.56/10 | 40 | 111 | Aug 2018 |
| 268 | sfb.gov.tw | 5.55/10 | 5 | 40 | Oct 2024 |
| 269 | csi.it | 5.55/10 | - | - | Jul 2018 |
| 270 | chugaiigaku.jp | 5.55/10 | 2 | 4 | Jul 2026 |
| 271 | yettel.bg | 5.54/10 | 55 | 67 | Mar 2023 |
| 272 | gachon.ac.kr | 5.54/10 | 300 | 73 | Jan 2019 |
| 273 | wuerth.it | 5.53/10 | - | 10 | Nov 2024 |
| 274 | sodisce.si | 5.51/10 | - | 1 | Dec 2018 |
| 275 | aracaju.se.gov.br | 5.50/10 | 460 | 956 | Jan 2019 |
| 276 | ishida.co.jp | 5.50/10 | 1 | 1 | Sep 2023 |
| 277 | jeonju.go.kr | 5.49/10 | - | - | Aug 2018 |
| 278 | rid.go.th | 5.49/10 | 3 | 5 | Dec 2021 |
| 279 | ptboard.com | 5.46/10 | 350 | 33 | Sep 2024 |
| 280 | escrip.com | 5.43/10 | 280 | 138 | Jan 2016 |
| 281 | spore.com | 5.41/10 | 5,700 | 1,095 | Jul 2017 |
| 282 | cbnu.ac.kr | 5.40/10 | 99 | 10 | Oct 2020 |
| 283 | unicordoba.edu.co | 5.36/10 | 96 | 32 | Nov 2023 |
| 284 | hkcsl.com | 5.35/10 | 960 | 805 | Jan 2016 |
| 285 | haw-kiel.de | 5.35/10 | 200 | 72 | Dec 2025 |
| 286 | yoga-lava.com | 5.35/10 | 32 | 19 | Aug 2018 |
| 287 | cabildodelapalma.es | 5.34/10 | 48 | 31 | Jul 2019 |
| 288 | arona.org | 5.33/10 | 220 | 374 | Jan 2023 |
| 289 | ivecogroup.com | 5.33/10 | 330 | 180 | Dec 2023 |
| 290 | catholic.ac.kr | 5.33/10 | 140 | 33 | Aug 2018 |
| 291 | wesleyancollege.edu | 5.33/10 | 4,900 | 1,169 | Jul 2018 |
| 292 | nongmin.com | 5.32/10 | 2 | 12 | Jan 2023 |
| 293 | regmurcia.com | 5.32/10 | 560 | 1,315 | Mar 2020 |
| 294 | donga.ac.kr | 5.32/10 | 11 | 6 | Aug 2018 |
| 295 | mju.ac.kr | 5.32/10 | 110 | 58 | Sep 2020 |
| 296 | shindan.co.jp | 5.32/10 | - | 3 | Feb 2025 |
| 297 | inje.ac.kr | 5.32/10 | 44 | 4 | Dec 2022 |
| 298 | macon.fr | 5.32/10 | 28 | 86 | Feb 2019 |
| 299 | kotora.jp | 5.32/10 | - | 11 | Apr 2019 |
| 300 | hscity.go.kr | 5.31/10 | 9 | 1 | Aug 2022 |
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).