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IPWhois vs OpenPLZ API

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

APIIPWhoisNEW—OpenPLZ APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSnoyes
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 OpenPLZ API: common questions

Which is more reliable, IPWhois or OpenPLZ API?

On our scheduled checks, OpenPLZ API leads on measured uptime — IPWhois at —% versus OpenPLZ API 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 IPWhois and OpenPLZ API need an API key?

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

Can I call IPWhois and OpenPLZ API from the browser?

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

Are IPWhois and OpenPLZ API free for commercial use?

IPWhois has unclear commercial terms, and OpenPLZ API 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.