runsonwhat

S21Sec's tech stack

What does S21Sec use?

S21Sec (s21sec.com) uses at least 6 tools we can see from public records, including Microsoft Azure for hosting, Microsoft 365 for email and documents, Dynamics 365 Customer Insights for marketing and Trellix Email Security for security. Last checked .

Industry
Computer Security
Founded
2002
Re-check liveVisit s21sec.com
Tools found
6
Categories
4
Layers
3 of 5
Last checked
Oct 2026

S21Sec's stack, layer by layer

Each tool links to the other companies we've found using it. The label says what kind of public trace gave it away.

Edge & Hosting

1 tool, where the bytes are served from

Hosting & Cloud

Go-to-market

2 tools, how they find and keep customers

Marketing

Company Ops

3 tools, what the team runs on day to day

Workspace

Security & Compliance

Companies like S21Sec also use

Tools common among companies with a similar stack that we haven't found at S21Sec.

Companies with a stack like S21Sec's

Ranked by shared tools, with rare tools counting more.

More Computer Security companies

Other Computer Security companies we've checked.

S21Sec tech stack FAQ

What tools does S21Sec use?

We've found 6 tools at S21Sec (s21sec.com). Edge & Hosting: Microsoft Azure. Go-to-market: Dynamics 365 Customer Insights. Company Ops: Microsoft 365, Apple Business and Trellix Email Security. Last checked October 4, 2026.

What cloud does S21Sec run on?

S21Sec uses Microsoft Azure for hosting. We found Microsoft Azure through DNS records.

What email provider does S21Sec use?

S21Sec uses Microsoft 365 and Apple Business for email and documents. We found Microsoft 365 through email records.

What marketing software does S21Sec use?

S21Sec uses Dynamics 365 Customer Insights for marketing. We found Dynamics 365 Customer Insights through DNS verification records.

Does S21Sec use Microsoft 365?

Yes. We found Microsoft 365 at S21Sec through email records. Microsoft 365 is used by 245,233 companies we track.

How does runsonwhat know what S21Sec uses?

We read public traces only: S21Sec's DNS and email records, certificate logs, the code its website loads, and published subprocessor lists. A tool is listed only when a direct record backs it up. DNS is rechecked weekly and the website monthly.

We read public traces only: DNS and email records, certificate logs, website code and published subprocessor lists. A tool is listed when a direct record backs it up, and dropped when a recheck no longer finds it. Is this your company? See how to opt out.