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IPWhois vs Postali

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

APIIPWhoisHEALTHY100PostaliHEALTHY99
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms2369
P95 · ms598824
AuthapiKeynone
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree — no key, no signup, no monthly limit (per site)
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

IPWhois vs Postali: common questions

Which is more reliable, IPWhois or Postali?

Both are neck-and-neck — IPWhois and Postali 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 Postali?

IPWhois has the lower median latency in our checks — IPWhois responds in 23 ms versus Postali at 69 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 Postali need an API key?

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

Can I call IPWhois and Postali from the browser?

Only Postali 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 Postali free for commercial use?

IPWhois has unclear commercial terms, and Postali 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.