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IPWhois vs PostcodeData.nl

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

APIIPWhoisHEALTHY100PostcodeData.nlHEALTHY91
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms23692
P95 · ms5981989
AuthapiKeynone
CORSyesyes
HTTPSnono
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

IPWhois vs PostcodeData.nl: common questions

Which is more reliable, IPWhois or PostcodeData.nl?

Both are neck-and-neck — IPWhois 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, IPWhois or PostcodeData.nl?

IPWhois has the lower median latency in our checks — IPWhois responds in 23 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 IPWhois and PostcodeData.nl need an API key?

PostcodeData.nl needs no key, while IPWhois requires a free API key. If you want to start calling without signup, reach for PostcodeData.nl first.

Can I call IPWhois and PostcodeData.nl from the browser?

Neither sends browser-friendly CORS headers reliably, so call IPWhois and PostcodeData.nl from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are IPWhois and PostcodeData.nl free for commercial use?

IPWhois 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.