shipapis
StarSubmit an APISubmit API

National Vulnerability Database vs Portscan

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

APINational Vulnerability DatabaseNEW—PortscanNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic domain (U.S. Government work)Unverified
Free tierFree — no key required (free key raises limits)Free — limits not published
Rate limit5 requests per rolling 30 seconds without an API key (50 with a free key)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

National Vulnerability Database vs Portscan: common questions

Which is more reliable, National Vulnerability Database or Portscan?

On our scheduled checks, Portscan leads on measured uptime — National Vulnerability Database 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 National Vulnerability Database and Portscan need an API key?

Neither needs a paid key — National Vulnerability Database 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 National Vulnerability Database and Portscan from the browser?

Yes — both National Vulnerability Database and Portscan send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are National Vulnerability Database and Portscan free for commercial use?

National Vulnerability Database allows commercial use on its free tier, 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.