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IPWhois vs SLF

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

APIIPWhoisNEW—SLFNEW—
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 — static file, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

IPWhois vs SLF: common questions

Which is more reliable, IPWhois or SLF?

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

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

Can I call IPWhois and SLF from the browser?

Only SLF 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 SLF free for commercial use?

IPWhois has unclear commercial terms, and SLF 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.