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ISO 3166 Updates API vs Proweblook IP Checker

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

APIISO 3166 Updates APIHEALTHY78Proweblook IP CheckerREACHABLE100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms140256
P95 · ms2526232
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limit500 req/windowUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ISO 3166 Updates API vs Proweblook IP Checker: common questions

Which is more reliable, ISO 3166 Updates API or Proweblook IP Checker?

Both are neck-and-neck — ISO 3166 Updates API and Proweblook IP Checker 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, ISO 3166 Updates API or Proweblook IP Checker?

Proweblook IP Checker has the lower median latency in our checks — ISO 3166 Updates API responds in 1402 ms versus Proweblook IP Checker at 56 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 ISO 3166 Updates API and Proweblook IP Checker need an API key?

ISO 3166 Updates API needs no key, while Proweblook IP Checker requires a free API key. If you want to start calling without signup, reach for ISO 3166 Updates API first.

Can I call ISO 3166 Updates API and Proweblook IP Checker from the browser?

Yes — both ISO 3166 Updates API and Proweblook IP Checker send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are ISO 3166 Updates API and Proweblook IP Checker free for commercial use?

ISO 3166 Updates API has unclear commercial terms, and Proweblook IP Checker 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.