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Microsoft Security Response Center (MSRC) vs Portscan

Same instrument, two spec sheets — measured, not claimed.

APIMicrosoft Security Response Center (MSRC)NEW—PortscanNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — no key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Microsoft Security Response Center (MSRC) vs Portscan: common questions

Which is more reliable, Microsoft Security Response Center (MSRC) or Portscan?

On our scheduled checks, Portscan leads on measured uptime — Microsoft Security Response Center (MSRC) at —% versus Portscan at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Microsoft Security Response Center (MSRC) and Portscan need an API key?

Neither needs a paid key — Microsoft Security Response Center (MSRC) is callable with no signup, and Portscan is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Microsoft Security Response Center (MSRC) and Portscan from the browser?

Only Portscan is browser-friendly — it returns CORS headers over HTTPS. Microsoft Security Response Center (MSRC) needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Microsoft Security Response Center (MSRC) and Portscan free for commercial use?

Microsoft Security Response Center (MSRC) has unclear commercial terms, and Portscan has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.