Companies Using Ubuntu

Ubuntu is the largest single operating-system signature in our data and also the one most often misread. Our August 2026 crawl detects it on 409,810 domains, 50.33% of the Operating Systems category and first of sixteen. None of that is useful until you know what the number counts. With over a decade spent on web crawling and technographic data, this is the profile where I most often see a real measurement quoted as if it meant something else.

What The 409,810 Actually Is

Ubuntu reaches us from exactly one place: the HTTP response header. A server that answers with nginx/1.18.0 (Ubuntu) or Apache/2.4.41 (Ubuntu) in its Server or X-Powered-By field is counted, and nothing else is. 99.29% of Ubuntu-detected domains also run Nginx or Apache, 432,413 of 435,509. That is not a coincidence about Ubuntu's ecosystem. It is the mechanism showing through, because those two web servers are how the token gets to us at all.

So 409,810 is a floor rather than an estimate, and three things hold it down. A CDN or reverse proxy answers with its own header and the origin's operating system disappears. Administrators suppress the token on purpose, and since ServerTokens Prod and server_tokens off are standard hardening advice, the more carefully an operator configures a server the less likely it is to appear here. And any Ubuntu machine that does not serve HTTP is invisible to us entirely. This is a count of domains that advertise Ubuntu, not a count of Ubuntu installations, and it says nothing about Ubuntu's standing among Linux distributions generally.

Sales Signal: The bias is itself information. A domain that discloses its operating system is running a directly addressable server someone configured by hand, not a managed platform and not a CDN-fronted edge deployment. For infrastructure tooling that is a far better qualified lead than a random Ubuntu install would be.

"The interesting part of a header-based count is what it leaves out. Every domain on this list either chose to expose its own server or never turned the disclosure off. That single fact tells you more about how the infrastructure is run than the operating system name does." - Mehmet Suleyman, CEO at TechnologyChecker.io

The Ranking Survives The Caveat

Because every operating system in this category is found through the same header, comparisons between them hold even though each count is a floor. Ubuntu's 409,810 runs against UNIX at 209,466, Debian at 130,134, CentOS at 32,041, AlmaLinux at 13,392 and Windows Server at 6,467. Roughly half of every domain that discloses an operating system discloses Ubuntu. The floors are not all equally deep: Debian-family builds print the distribution into the Nginx and Apache version string by default, while Microsoft-IIS reports its own version and no operating system, so Windows Server's 6,467 understates Windows Server by considerably more than 409,810 understates Ubuntu.

Ubuntu Beats CentOS And Loses To Debian

Since tracking began in March 2026, 198 domains moved from CentOS to Ubuntu and 26 went the other way. A 7.6 to 1 margin is exactly what the CentOS end-of-life migration should look like, and it is the cleanest switching signal on this profile.

Debian is the opposite, and it is the finding most Ubuntu market-share pages will not tell you. 280 domains arrived from Debian and 423 left for it, a net 143 against Ubuntu, which makes Debian the largest corridor on this profile in either direction and the only one that runs the wrong way at scale. Ubuntu is built on Debian, so operators moving that way are usually trading Canonical's release cadence and Snap packaging for a slower, plainer base rather than leaving the family. It is still a loss on the scoreboard.

One caveat, stated plainly. A header token can change because someone rebuilt a server or because someone edited a configuration file. The CentOS ratio is too lopsided for configuration drift to account for. The Debian corridor is much closer, and a few tens of domains either way would change how it reads, so treat that direction as real and the magnitude as approximate.

"Everyone writes about Ubuntu versus Red Hat. In the switching data the live corridor is Ubuntu versus Debian, it runs 423 out against 280 in, and almost nobody covers it." - Mehmet Suleyman, CEO at TechnologyChecker.io

Who Is Actually On It

We match 227,955 of the detected domains to a company record, and the shape is what a free server operating system should produce. 57.19% belong to organisations with 1 to 10 employees and 82.5% to organisations with 50 or fewer. The head is not thin, though. The University of California, Kroger, Air Liquide, the American Red Cross, Penn State, Medecins Sans Frontieres, Cambridge, Gucci, Waste Management, O'Reilly Auto Parts and Bharat Heavy Electricals all appear, and universities in particular are everywhere in this data.

By industry the base is flat. IT Services and IT Consulting leads at 7.33%, Software Development at 5.97% and Technology, Information and Internet at 4.10%. Nothing breaks 8% and the top ten verticals together reach only 35.54%, which is the correct shape for infrastructure: Ubuntu does not select an industry, it selects whoever provisions their own servers. By age, 39.12% of matched domains belong to companies founded in the 2010s and 22.16% in the 2020s, but 8.57% predate 1980, which is the university and public-institution cohort making itself felt.

Sales Signal: Almost every enterprise detection sits on a secondary property: libraries.universityofcalifornia.edu, sustainability.wm.com, docs.paloaltonetworks.com, tenders.bhel.com. These are departmental or project deployments, so the buyer is a team lead rather than a CIO and the pitch is standardisation, not first adoption.

India Comes Second

The United States leads with 49,791 domains, which surprises nobody. India at 21,746 should. It places second, ahead of Germany (14,985), the United Kingdom (12,684) and Brazil (11,790), with France (7,348), Canada (6,880) and Italy (6,560) behind. Ubuntu costs nothing and is the default image on the cheap VPS tier, and both matter more in a price-sensitive market than in a procurement-led one. The named Indian organisations reinforce it: Ola, Myntra, Havells, Biocon, Steel Authority of India, Muthoot Finance, Intas Pharmaceuticals and Tata Consulting Engineers.

Sales Signal: If you sell Linux tooling into a pipeline that stops at the US and Western Europe, the Indian install base here is larger than Germany's and gets a fraction of the coverage.

What The Stack Says

jQuery appears on 58.63% of Ubuntu domains, Google Analytics on 44.00%, core-js on 27.96% and WordPress on 25.64%. That is a general-purpose web host, not a specialised platform. Nginx at 57.74% and Apache at 43.91% should be read as the detection mechanism rather than a finding, since the Ubuntu token lives inside their version strings.

The number worth your attention is Cloudflare at 10.80%. At face value it says Ubuntu operators avoid CDNs. Read correctly it says a CDN in front of an origin normally replaces the header we depend on, so CDN-fronted Ubuntu servers are missing from this data by construction. It is the clearest illustration on the page of why the count is a floor.

Key Takeaways

1. 409,810 is a disclosure count, not an install count. It measures domains whose web server advertises Ubuntu in its headers. CDNs, hardening and non-HTTP machines all sit outside it.
2. The ranking still stands. Every operating system in the category shares the detection surface, so 50.33% share and first of sixteen is a like-for-like result.
3. CentOS to Ubuntu runs 7.6 to 1. 198 domains in, 26 out, consistent with the documented end-of-life wave.
4. Debian runs against Ubuntu. 423 out against 280 in, a net 143 loss, and the largest corridor on the profile.
5. Small operators by volume, institutions at the head. 57.19% at 1 to 10 employees, alongside Cambridge, Penn State and the University of California.

Sales Applications

Outreach template: "Hi [Name], several of [Company]'s subdomains are served from hosts that advertise Ubuntu in their response headers. Since March we have recorded 198 domains moving off CentOS onto Ubuntu against 26 going the other way. Is consolidating those hosts onto one distribution on your roadmap this year?"

Targeting strategy: Filter for Ubuntu with no CDN overlap. Those operators run their own origins directly, which is the segment that buys configuration management, patching and monitoring. Add a CentOS or AlmaLinux detection on the same account to find estates mid-migration.

Competitive angle: Ubuntu's licence costs nothing and its support is optional, so the sale is never displacement. It is whatever the free tier does not cover: security maintenance beyond the standard LTS window, compliance evidence, and someone to call at 3am.

Explore the full Ubuntu install base at TechnologyChecker.io. Our dataset covers 409,810 detected domains, 227,955 of them matched to company records with industry, size, location and stack data.