50 live ef.js sites, ready to export.
That's how many ef.js websites are in VersionDB right now, each with its full tech stack, contact details, and social profiles.
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Every ef.js website we detected in Argentina.
Only sites where a personal, company-hosted email was found.
Sites with at least one personnel LinkedIn profile.
Start with the highest-traffic end of the dataset.
Limit results to ef.js websites on .com domains.
Only sites where an organisation phone number was found.
Websites Using ef.js
A sample of live ef.js sites from our latest crawl, with the other technologies each one runs.
| Domain | Also runs | Crawl Date |
|---|---|---|
| colkin.online | August 19, 2026 | |
| civi-land-int.com | August 18, 2026 | |
| smarterforms.com | August 18, 2026 | |
| unvm.edu.ar | August 18, 2026 | |
| zeppelinpm.ru | August 17, 2026 | |
| pakval.com.ua | August 17, 2026 | |
| unsanisidro.edu.ar | August 17, 2026 | |
| jusentrerios.gov.ar | August 17, 2026 | |
| soccoop.ar | August 17, 2026 | |
| iqrabelgium.be | August 17, 2026 |
How many websites use ef.js?
We found ef.js on 50 websites in our August 2026 crawl, across 19 countries.
Which countries use ef.js the most?
By number of websites, the top countries are Argentina (28%, 14 sites), Japan (18%, 9 sites), United States (10%, 5 sites), China (6%, 3 sites) and Belgium (4%, 2 sites). Together they account for 66% of the 50 ef.js sites we track. 28% of the sites are in Spanish, and .com is the most used domain ending, on 26% of them.
Where are ef.js websites hosted?
The networks carrying the most ef.js sites are Amazon.com, Inc. (6 sites), Red de Interconexion Universitaria (6 sites) and OVH SAS (5 sites).
What technologies are used with ef.js?
Across the 50 ef.js sites we track, the technologies most often found alongside it are jQuery (76%, 38 sites), PHP (50%, 25 sites), Apache HTTP Server (46%, 23 sites), jQuery Migrate (34%, 17 sites) and jQuery UI (32%, 16 sites).
Breakdown of ef.js websites
What else they run, plus their language, hosting network, domain extension and country.
| Technology | Sites |
|---|---|
jQuery | 38 |
PHP | 25 |
Apache HTTP Server | 23 |
|
jQuery Migrate | 17 |
jQuery UI | 16 |
Bootstrap | 15 |
Nginx | 15 |
Google Analytics | 14 |
MySQL | 12 |
WordPress | 12 |
Debian | 8 |
| HSTS | 8 |
jsDelivr | 8 |
Google Tag Manager | 6 |
Cloudflare | 5 |
Swiper | 5 |
cdnjs | 5 |
Contact Form 7 | 4 |
Google Hosted Libraries | 4 |
LiteSpeed | 4 |
Microsoft ASP.NET | 4 |
OWL Carousel | 4 |
Ubuntu | 4 |
YouTube | 4 |
reCAPTCHA | 4 |
| Language | Sites |
|---|---|
| Spanish | 14 |
| Japanese | 9 |
| English | 6 |
| Chinese | 4 |
| French | 3 |
| Persian | 2 |
| Russian | 2 |
| Georgian | 1 |
| Dutch | 1 |
| Polish | 1 |
| Portuguese | 1 |
| Romanian | 1 |
| Southern Sotho | 1 |
| Swahili | 1 |
| Swedish | 1 |
| Thai | 1 |
| Turkish | 1 |
| ASN | Sites |
|---|---|
| Amazon.com, Inc. | 6 |
| Red de Interconexion Universitaria | 6 |
| OVH SAS | 5 |
| Xserver Inc. | 4 |
| Dattatec.com | 3 |
| GMO Internet, Inc. | 2 |
| One.com A/S | 2 |
| SAKURA Internet Inc. | 2 |
| Telecom Argentina S.A. | 2 |
| China Unicom Beijing Province Network | 1 |
| Cloudflare, Inc. | 1 |
| DXTL Tseung Kwan O Service | 1 |
| Domain names registrar REG.RU, Ltd | 1 |
| Faraso Samaneh Pasargad Ltd. | 1 |
| Google LLC | 1 |
| Hangzhou Alibaba Advertising Co.,Ltd. | 1 |
| Hetzner Online GmbH | 1 |
| Ict Bulut Bilisim A.s. | 1 |
| Liquid Web, L.L.C | 1 |
| Proservice LLC | 1 |
| Sony Network Taiwan Limited | 1 |
| Sub 6 Limited | 1 |
| UNE EPM TELECOMUNICACIONES S.A. | 1 |
| UNIVERSIDAD NACIONAL DE VILLA MARIA | 1 |
| Vandad Vira Hooman LLC | 1 |
| TLD | Sites |
|---|---|
| com | 13 |
| ar | 9 |
| jp | 5 |
| 78 | 2 |
| be | 2 |
| ir | 2 |
| 210 | 1 |
| 28 | 1 |
| 56 | 1 |
| cn | 1 |
| ge | 1 |
| info | 1 |
| it | 1 |
| net | 1 |
| nl | 1 |
| nu | 1 |
| online | 1 |
| ro | 1 |
| ru | 1 |
| tr | 1 |
| tw | 1 |
| ua | 1 |
| uk | 1 |
| Country | Sites |
|---|---|
| 🇦🇷 Argentina | 14 |
| 🇯🇵 Japan | 9 |
| 🇺🇸 United States | 5 |
| 🇨🇳 China | 3 |
| 🇧🇪 Belgium | 2 |
| 🇬🇧 United Kingdom | 2 |
| 🇮🇷 Iran | 2 |
| 🇨🇴 Colombia | 1 |
| 🇩🇰 Denmark | 1 |
| 🇫🇷 France | 1 |
| 🇬🇪 Georgia | 1 |
| 🇮🇹 Italy | 1 |
| 🇳🇱 Netherlands | 1 |
| 🇷🇴 Romania | 1 |
| 🇷🇺 Russia | 1 |
| 🇸🇬 Singapore | 1 |
| 🇹🇷 Turkey | 1 |
| 🇹🇼 Taiwan | 1 |
| 🇺🇦 Ukraine | 1 |
| Unknown | 1 |
Other technologies in JavaScript frameworks
JavaScript frameworks technologies run on 17.39% of the websites we track. ef.js ranks #51 of 63, on under 0.01% of JavaScript frameworks sites.
React
4,335,656 sites, 48.95%- WOW 1,286,818 sites, 14.53%
Vue.js
837,636 sites, 9.46%
AMP
556,733 sites, 6.29%
Next.js
549,287 sites, 6.2%
Nuxt.js
361,766 sites, 4.08%
Alpine.js
275,191 sites, 3.11%
Backbone.js
245,426 sites, 2.77%
FAQ
Answers drawn from our latest crawl of ef.js websites. Anything else, email us and we will look it up.
Through our own crawl, which checks each site's HTML, scripts and headers rather than relying on self-reported data.