CELSA's tech stack
What does CELSA use?
CELSA (celsagroup.com) uses at least 6 tools we can see from public records, including Microsoft 365 for email and documents and GlobalSign for security. Last checked .
- Industry
- Steelmaking
- Size
- 10,000+ employees
- Based in
- Castellbisbal, Spain
- Founded
- 1967
- Company page
- Tools found
- 6
- Categories
- 3
- Layers
- 2 of 5
- Changes seen
- 1
CELSA'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
Company Ops
5 tools, what the team runs on day to day
Workspace
Security & Compliance
What changed at CELSA
Recent starts and stops
CELSA tech stack FAQ
What tools does CELSA use?
As of October 2026, runsonwhat has found 6 tools at CELSA (celsagroup.com) in public records. Edge & Hosting: Amazon Route 53. Company Ops: Microsoft 365, GlobalSign and Proofpoint. Last checked October 20, 2026.
What email provider does CELSA use?
CELSA uses Microsoft 365 for email and office software, according to runsonwhat (October 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365 and email records. Microsoft 365 is used by 711,310 companies runsonwhat tracks.
Does CELSA use Amazon Route 53?
Yes. runsonwhat found Amazon Route 53 at CELSA through DNS records that point at Amazon Route 53. Amazon Route 53 is a DNS tool used by 84,878 companies runsonwhat tracks.
Has CELSA changed tools recently?
Yes. On runsonwhat's rechecks, CELSA started using Symantec Email Security.cloud (latest on October 9, 2026). A change counts only between two checks of celsagroup.com done the same way.
How does runsonwhat know what CELSA uses?
runsonwhat reads public records only. Of the 6 tools at CELSA, 3 were found through DNS records, 2 through email records and 1 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and celsagroup.com about 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.