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IP Address API vs PostcodeData.nl

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

APIIP Address APINEW—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

IP Address API vs PostcodeData.nl: common questions

Which is more reliable, IP Address API or PostcodeData.nl?

On our scheduled checks, PostcodeData.nl leads on measured uptime — IP Address API 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 IP Address API and PostcodeData.nl need an API key?

Neither needs a paid key — IP Address API 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 IP Address API and PostcodeData.nl from the browser?

Only IP Address API 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 IP Address API and PostcodeData.nl free for commercial use?

IP Address API 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.