Companies Using Azure Monitor

A decade of building crawling infrastructure, first on Google Search and now at TechnologyChecker.io, has taught me to read the detection rule before the number. As of our September 2026 crawl we see Azure Monitor on 34,255 domains and hold company records for 18,057. The rule matches one host, js.monitor.azure.com, which serves the Application Insights browser SDK. So this describes sites loading browser telemetry: Azure Monitor's server and infrastructure collection is invisible to a crawler, which makes 34,255 a floor, not a customer count.

Growth trajectory

The chart runs from 20,487 domains in June 2026 to 34,255 in September, and the early part is us, not them. Of the 10,221 domains that first showed the SDK in July, 9,347 were sites our crawl reached for the first time within three days. These counts are not a like-for-like series: the domains we crawl turn over monthly as dead sites drop out and newly found ones are added, and our detection signals widen over time.

August and September are the readable months. In August, 837 of 2,902 new detections were new-to-crawl domains; in September, 197 of 1,242. The rest landed on sites we were already watching, the closest this series gets to adoption. Going the other way, 2,763 domains dropped Azure Monitor since we began tracking it in March 2026, and 43.8% of those rows were seen only once.

Sales Signal: Don't build a churn play on the 2,763. With 43.8% single sightings, most of that pool is a script that briefly disappeared, not a decision. The usable signal is the August and September additions.

"Nine thousand of the ten thousand domains that appeared in July were ones we had only just started crawling. That is our coverage moving, not Microsoft's install base. Read a technographic chart without asking which months are coverage and you'll buy a story that never happened." - David Thomson, CTO at TechnologyChecker.io

Customer profile

Two numbers describe this base better than any label. 32.23% of the 9,225 companies with a founding year predate 1960, and 1,706 of 16,798 sized companies employ more than 1,000 people. Old and institutional: Ericsson, McKesson, Pemex, Securitas, Sandvik, Teva, the Metropolitan Police.

The small half means something else. 35.79% have ten employees or fewer, mostly municipal bodies that got the SDK with their website platform. Check the detection host on enterprise rows too: Lumen's is controlcenter.lumen.com, Chubb's hub.apac.chubb.com, Travelers' claim-services.travelers.com. Single applications instrumented by one team, not company-wide contracts. Microsoft instruments its own techcommunity.microsoft.com the same way.

Sales Signal: Filter for the 1,706 companies above 1,000 employees and read the detection URL, not the domain. A portal subdomain means one application team picked Application Insights, a warm entry for anything that plugs into an Azure estate.

Industry and geographic concentration

Government Administration looks like the story at 14.11%. It isn't. 3,274 of the 34,576 live domains (9.5%) belong to CivicPlus, the US municipal website platform, identified by a shared docaccess.com/docbox.js asset, confirmed on four of four sampled sites. 1,585 of the 2,229 government rows are that fleet. Remove it and government falls to 4.84%, a hair ahead of Financial Services at 4.18%.

Geography beats the usual US-then-UK shape. The United States holds 8,952 of 17,668 placed companies (50.67%) and the UK 2,006 (11.35%), but the Netherlands, Norway, Sweden and Denmark contribute 2,412 between them, past Canada, Germany and France combined. Nordic health bodies run heavy Microsoft estates: Helse Sor-Ost, Region Stockholm and DNV all appear.

Sales Signal: Treat Government Administration as two markets. The CivicPlus fleet is one platform decision, so you sell to CivicPlus, not 3,274 city halls. The other 644 government domains are individual buyers, and the Nordic cluster is the least crowded slice of them.

What the legacy CDN shows

The same SDK also ships from an older host, az416426.vo.msecnd.net, which we count separately. It covers 33,921 domains against 34,576 on the current host. 23,612 carry both, 10,309 are legacy-only, the union is 44,885 domains, and neither set contains the other, roughly 68% each way. That's a migration in progress: two thirds of the legacy population has added the current host, ten thousand haven't started.

No migration table ships here, and this is why. Of the 2,555 domains that left, Sentry sits on 5.32% against 4.4% of stayers, a 1.21x lift nowhere near our 2x bar. New Relic is commoner among stayers (1.02% against 0.59%). Datadog's 28 leavers fall under our floor of 50. Monitoring tools stack rather than replace each other, and a page dropping this SDK has usually just stopped instrumenting the browser.

Sales Signal: The 10,309 legacy-only domains are the cleanest list here. They run an SDK build Microsoft has moved past, a checkable reason to open a conversation, and they already use the Azure Monitor data model.

"Two thirds of the sites on the old SDK host have already added the new one. That isn't churn, it's a slow rollout, and the ten thousand that haven't moved are usually the ones with nobody maintaining the front end." - David Thomson, CTO at TechnologyChecker.io

Technology ecosystem

The number I expected to be high is low. Only 39.48% of these domains also show our Azure hosting signal, itself a floor, so call it four in ten at minimum. Plenty of these sites are hosted elsewhere: Cloudflare fronts 45.36%, nine times Azure Edge Network's 5.05%, and Amazon Web Services covers 7.99%.

Google Analytics runs on 69.34%: engineering owns the Application Insights beacon, marketing owns the analytics. Siteimprove (3.10%) and Monsido (2.31%) both show up, public-sector web governance tools, the CivicPlus fleet again. The framework column is odder. Alpine.js at 16.04% beats Vue (7.15%) and React (6.92%) combined, and Alpine is what you add to a server-rendered template, so this base is institutional CMS sites, not single-page apps.

Sales Signal: A domain running Application Insights and Cloudflare but no Azure hosting signal is a hybrid estate, buying observability for a front end hosted somewhere else. Reachable without moving the whole stack.

Key takeaways

1. 34,255 domains is a floor, not a customer count. The rule sees one host serving the Application Insights browser SDK; server and container telemetry stays invisible.

2. The June to July step is coverage. 9,347 of July's 10,221 new detections were domains we had just started crawling.

3. Government at 14.11% is one platform. CivicPlus supplies 3,274 domains and 1,585 of the 2,229 government rows; the honest figure is 4.84%.

4. The install base is old and large. 32.23% of dated companies predate 1960, 10.16% employ over 1,000 people, and the Nordics over-index.

5. The SDK migration is two thirds done. 23,612 domains run both hosts, 10,309 remain legacy-only, union 44,885.

Sales applications

Outreach template. For a legacy-only domain: "You're still loading the Application Insights SDK from az416426.vo.msecnd.net. We track 44,885 domains running it, and 23,612 have already added the current host. Worth ten minutes on what your front-end telemetry is missing?" Checkable in a browser network tab, and it claims nothing about their contract.

Targeting strategy. On TechnologyChecker.io, filter the 18,057 enriched companies to 1,000-plus employees, exclude Government Administration to drop the CivicPlus fleet, then sort by whether the detection sits on a portal subdomain. That leaves application owners, not procurement.

Competitive angle. Pitch alongside Azure Monitor, not against it. Our leaver analysis found no corridor to Sentry, New Relic or Datadog, because these tools coexist. G2 rates Azure Monitor 4.3 out of 5 across 107 reviews, so this is not an unhappy base.

Every figure here comes from our own crawl: 34,255 domains loading the Application Insights browser SDK and 18,057 enriched companies with size, country, industry and founding year attached. Browse the list on TechnologyChecker.io and export what you need.