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HackMyIP vs Postcodes.io

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

APIHackMyIPNEW—Postcodes.ioNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseUnverifiedService MIT-licensed; postcode data license unverified
Free tierCompletely free — no API key, no signupFree — no key required
Rate limit100 req/windowUnpublished (no key; fair use)
In directory since2026-07-052026-07-05
operationalpartialdownno data

HackMyIP vs Postcodes.io: common questions

Which is more reliable, HackMyIP or Postcodes.io?

On our scheduled checks, Postcodes.io leads on measured uptime — HackMyIP at —% versus Postcodes.io 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 HackMyIP and Postcodes.io need an API key?

Neither needs a paid key — HackMyIP is callable with no signup, and Postcodes.io is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call HackMyIP and Postcodes.io from the browser?

Yes — both HackMyIP and Postcodes.io 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 HackMyIP and Postcodes.io free for commercial use?

HackMyIP allows commercial use on its free tier, and Postcodes.io 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.