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IP Address API vs PostcodeData.nl

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

APIIP Address APIHEALTHY93PostcodeData.nlHEALTHY91
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms513692
P95 · ms37361989
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?

Both are neck-and-neck — IP Address API and PostcodeData.nl each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

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

IP Address API has the lower median latency in our checks — IP Address API responds in 513 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 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.