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Ducks Unlimited vs PostcodeData.nl

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

APIDucks UnlimitedNEW—PostcodeData.nlNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Ducks Unlimited vs PostcodeData.nl: common questions

Which is more reliable, Ducks Unlimited or PostcodeData.nl?

On our scheduled checks, PostcodeData.nl leads on measured uptime — Ducks Unlimited at —% versus PostcodeData.nl 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 Ducks Unlimited and PostcodeData.nl need an API key?

Neither needs a paid key — Ducks Unlimited is callable with no signup, and PostcodeData.nl is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Ducks Unlimited and PostcodeData.nl from the browser?

Only Ducks Unlimited is browser-friendly — it returns CORS headers over HTTPS. PostcodeData.nl needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Ducks Unlimited and PostcodeData.nl free for commercial use?

Ducks Unlimited has unclear commercial terms, and PostcodeData.nl 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.