Web servers
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H2O is a fast and secure HTTP/2 server written in C by Kazuho Oku.
Disclaimer: The data used in this report is collected from the current VersionDB release (February 2026) containing a total of 12,727,168 domains. All statistics reflect this dataset and do not claim to represent all websites globally.
H2O Complementary Technologies
Technologies frequently found with H2O.
Live H2O Sites
62
Complementary Tech
74
Most Frequent Complementary Tech
Websites Using H2O
An unordered, non-ranked list generated from observed technology data.
| Domain | Server Location | ASN | Crawl Date |
|---|---|---|---|
| nursta.jp | π―π΅ Japan | SAKURA Internet Inc. | February 14, 2026 |
| growth-and.com | πΉπΌ Taiwan | Google LLC | February 14, 2026 |
| supoharazero.org | π―π΅ Japan | SAKURA Internet Inc. | February 14, 2026 |
| bigberries-school.com | π―π΅ Japan | SAKURA Internet Inc. | February 14, 2026 |
| ourpractice.net | πΊπΈ United States | Google LLC | February 14, 2026 |
| rgbstock.de | π©πͺ Germany | Hetzner Online GmbH | February 14, 2026 |
| mytaxrentals.co.nz | π³πΏ New Zealand | Solarix Networks Limited | February 14, 2026 |
| khanpainters.co.nz | π³πΏ New Zealand | Solarix Networks Limited | February 14, 2026 |
| juusta.jp | π―π΅ Japan | SAKURA Internet Inc. | February 14, 2026 |
| rgbstock.nl | π©πͺ Germany | Hetzner Online GmbH | February 14, 2026 |
| greenjobs.at | π©πͺ Germany | Hetzner Online GmbH | February 14, 2026 |
| eejobs.de | π©πͺ Germany | Hetzner Online GmbH | February 13, 2026 |
| ntecs.de | π©πͺ Germany | Hetzner Online GmbH | February 13, 2026 |
| bessplus.cz | π¨πΏ Czech Republic | WEDOS Internet, a.s. | February 13, 2026 |
| suma.ac.jp | π―π΅ Japan | SAKURA Internet Inc. | February 13, 2026 |
| taiget.ru | π·πΊ Russia | LLC Multiservice | February 8, 2026 |
| merryleeselectrical.co.nz | π³πΏ New Zealand | Solarix Networks Limited | February 8, 2026 |
| thewholenineyards.co.nz | π³πΏ New Zealand | Solarix Networks Limited | February 8, 2026 |
| kents.info | π―π΅ Japan | Amazon.com, Inc. | February 8, 2026 |
| sumashuku.jp | π―π΅ Japan | SAKURA Internet Inc. | February 8, 2026 |
| gtautoelectrix.co.nz | π³πΏ New Zealand | Solarix Networks Limited | February 8, 2026 |
| tuki-to-panda.com | π―π΅ Japan | SAKURA Internet Inc. | February 8, 2026 |
| grafi.jp | π―π΅ Japan | SAKURA Internet Inc. | February 8, 2026 |
| tam-kikaku.com | π―π΅ Japan | SAKURA Internet Inc. | February 8, 2026 |
| lovesaemi.daemon.asia | π―π΅ Japan | OPTAGE Inc. | February 8, 2026 |
| velocompany.de | π©πͺ Germany | Hetzner Online GmbH | February 7, 2026 |
| tiksi.net | π©πͺ Germany | netcup GmbH | February 7, 2026 |
| ahti.space | π¨π¦ Canada | OVH SAS | February 7, 2026 |
| zotum.net | π©πͺ Germany | Hetzner Online GmbH | February 7, 2026 |
| kapiti.accountants | π³πΏ New Zealand | Solarix Networks Limited | February 7, 2026 |
| fef.net | πΊπΈ United States | Wisconsin CyberLynk Network, Inc. | February 7, 2026 |
| dunedinurgentdoctors.co.nz | π³πΏ New Zealand | Solarix Networks Limited | February 7, 2026 |
| mono-trend.com | π―π΅ Japan | Amazon.com, Inc. | February 7, 2026 |
| solarserver.de | π©πͺ Germany | Hetzner Online GmbH | February 7, 2026 |
| philpaccounting.com | π³πΏ New Zealand | Solarix Networks Limited | February 7, 2026 |
| incurvy.de | π©πͺ Germany | Host Europe GmbH | February 7, 2026 |
| nishida-museum.com | π―π΅ Japan | SAKURA Internet Inc. | February 7, 2026 |
| ebengineering.co.nz | π³πΏ New Zealand | Solarix Networks Limited | February 7, 2026 |
| subaco.me | π―π΅ Japan | NTT PC Communications, Inc. | February 7, 2026 |
| caremad.io | πΊπΈ United States | DigitalOcean, LLC | February 7, 2026 |
| peco-japan.com | π―π΅ Japan | Amazon.com, Inc. | February 7, 2026 |
| archt-study.com | π―π΅ Japan | SAKURA Internet Inc. | February 7, 2026 |
| hari-study.com | π―π΅ Japan | SAKURA Internet Inc. | February 7, 2026 |
| viragetterem.hu | π©πͺ Germany | Aruba S.p.A. | February 7, 2026 |
| kotka.de | π©πͺ Germany | Hetzner Online GmbH | February 7, 2026 |
| stfuawsc.com | π―π΅ Japan | SAKURA Internet Inc. | February 7, 2026 |
| krats.se | πΈπͺ Sweden | Telenor Sverige AB | February 7, 2026 |
| rgbstock.com | π©πͺ Germany | Hetzner Online GmbH | February 6, 2026 |
| mourjan.com | π©πͺ Germany | Hetzner Online GmbH | February 6, 2026 |
| rgbstock.cn.com | π©πͺ Germany | Hetzner Online GmbH | February 6, 2026 |
Find Your Customers By Their Technologies
12,727,168 domains across 3,651 technologies. Ready for lead generation, market research, and security analysis.
Buy Now β $199.95 USDTop H2O Identifiers
Who is using H2O and where.
Countries
Top 5 most detected countries for H2O
ASNs
Top 5 most detected ASNs for H2O
Languages
Top 5 most detected Languages for H2O
TLDs
Top 5 most detected TLDs for H2O
Most Frequent H2O Identifiers and Complementary Tech
Most frequently encountered identifiers for H2O and its complementary technologies.
| Technology | Sites |
|---|---|
| C | 62 |
| HTTP/2 | 62 |
| jQuery | 26 |
| PHP | 24 |
| HSTS | 23 |
| Bootstrap | 22 |
| WordPress | 17 |
| MySQL | 17 |
| Cloudflare | 16 |
| cdnjs | 16 |
| Font Awesome | 14 |
| Google Analytics | 13 |
| Varnish | 11 |
| Express | 11 |
| Node.js | 11 |
| Google Tag Manager | 10 |
| HTTP/3 | 9 |
| jQuery Migrate | 8 |
| Google Hosted Libraries | 7 |
| Media.net | 7 |
| Google AdSense | 6 |
| reCAPTCHA | 4 |
| BootstrapCDN | 4 |
| jQuery CDN | 4 |
| All in One SEO | 4 |
| Contact Form 7 | 3 |
| Yoast SEO | 3 |
| YouTube | 2 |
| All in One SEO Pack | 2 |
| Gravatar | 2 |
| Awesomplete | 2 |
| Debian | 2 |
| Pure CSS | 2 |
| WooCommerce | 1 |
| jQuery UI | 1 |
| 1 | |
| Instagram Feed for WordPress | 1 |
| Crayon Syntax Highlighter | 1 |
| Prism | 1 |
| Themonic Iconic One | 1 |
| Site Kit | 1 |
| FancyBox | 1 |
| WordPress Block Editor | 1 |
| OWL Carousel | 1 |
| Underscore.js | 1 |
| Adobe Fonts | 1 |
| Breadcrumb NavXT | 1 |
| Buy me a coffee | 1 |
| Autoptimize | 1 |
| OXID eShop Community Edition | 1 |
| Language | Sites |
|---|---|
| English | 19 |
| Japanese | 19 |
| German | 11 |
| Chinese | 6 |
| Swahili | 4 |
| Dutch | 4 |
| Esperanto | 3 |
| Yoruba | 3 |
| Latin | 3 |
| Catalan | 2 |
| Afrikaans | 2 |
| French | 2 |
| Spanish | 1 |
| MΔori | 1 |
| Greek | 1 |
| Czech | 1 |
| Swedish | 1 |
| Arabic | 1 |
| Estonian | 1 |
| Portuguese | 1 |
| Russian | 1 |
| Romanian | 1 |
| Hungarian | 1 |
| Shona | 1 |
| Slovak | 1 |
| Finnish | 1 |
| ASN | Sites |
|---|---|
| SAKURA Internet Inc. | 17 |
| Hetzner Online GmbH | 16 |
| Solarix Networks Limited | 11 |
| Amazon.com, Inc. | 3 |
| Google LLC | 2 |
| OVH SAS | 2 |
| Host Europe GmbH | 1 |
| OPTAGE Inc. | 1 |
| LLC Multiservice | 1 |
| Aruba S.p.A. | 1 |
| WEDOS Internet, a.s. | 1 |
| Wisconsin CyberLynk Network, Inc. | 1 |
| netcup GmbH | 1 |
| DigitalOcean, LLC | 1 |
| NTT PC Communications, Inc. | 1 |
| GMO Internet Group, Inc. | 1 |
| Telenor Sverige AB | 1 |
| TLD | Sites |
|---|---|
| com | 13 |
| co.nz | 9 |
| de | 8 |
| jp | 5 |
| net | 5 |
| org | 3 |
| hu | 1 |
| info | 1 |
| ac.jp | 1 |
| nl | 1 |
| com.br | 1 |
| accountants | 1 |
| at | 1 |
| shop | 1 |
| cn.com | 1 |
| cz | 1 |
| fr | 1 |
| se | 1 |
| es | 1 |
| daemon.asia | 1 |
| io | 1 |
| me | 1 |
| space | 1 |
| ru | 1 |
| tech | 1 |
| Country | Sites |
|---|---|
| π―π΅ Japan | 23 |
| π©πͺ Germany | 19 |
| π³πΏ New Zealand | 11 |
| πΊπΈ United States | 3 |
| π¨π¦ Canada | 2 |
| πΉπΌ Taiwan | 1 |
| πΈπͺ Sweden | 1 |
| π¨πΏ Czech Republic | 1 |
| π·πΊ Russia | 1 |