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HOL Registry Broker vs Lookup.im API

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

APIHOL Registry BrokerHEALTHY94Lookup.im APIHEALTHY84
Uptime · 30d
Uptime · 90d99.02%99.02%
Uptime · 30d100%100%
P50 · ms3861158
P95 · ms9133581
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

HOL Registry Broker vs Lookup.im API: common questions

Which is more reliable, HOL Registry Broker or Lookup.im API?

Both are neck-and-neck — HOL Registry Broker and Lookup.im API each measure 99.02% 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, HOL Registry Broker or Lookup.im API?

HOL Registry Broker has the lower median latency in our checks — HOL Registry Broker responds in 386 ms versus Lookup.im API at 1158 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 HOL Registry Broker and Lookup.im API need an API key?

Both ask you to authenticate — HOL Registry Broker uses an API key and Lookup.im API uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call HOL Registry Broker and Lookup.im API from the browser?

Neither sends browser-friendly CORS headers reliably, so call HOL Registry Broker and Lookup.im API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are HOL Registry Broker and Lookup.im API free for commercial use?

HOL Registry Broker has unclear commercial terms, and Lookup.im API 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.