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IP Address API vs Zipcodestack

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

APIIP Address APINEW—ZipcodestackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

IP Address API vs Zipcodestack: common questions

Which is more reliable, IP Address API or Zipcodestack?

On our scheduled checks, Zipcodestack leads on measured uptime — IP Address API at —% versus Zipcodestack 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 IP Address API and Zipcodestack need an API key?

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

Can I call IP Address API and Zipcodestack from the browser?

Yes — both IP Address API and Zipcodestack 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 IP Address API and Zipcodestack free for commercial use?

IP Address API has unclear commercial terms, and Zipcodestack 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.