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IP Data API vs PostcodeData.nl

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

APIIP Data APIHEALTHY96PostcodeData.nlHEALTHY91
Uptime · 30d
Uptime · 90d99.02%100%
Uptime · 30d100%100%
P50 · ms124692
P95 · ms20821989
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 Data API vs PostcodeData.nl: common questions

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

On our scheduled checks, PostcodeData.nl leads on measured uptime — IP Data API at 99.02% versus PostcodeData.nl at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, IP Data API or PostcodeData.nl?

IP Data API has the lower median latency in our checks — IP Data API responds in 124 ms versus PostcodeData.nl at 692 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do IP Data API and PostcodeData.nl need an API key?

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

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

IP Data 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.