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Callook.info vs HOL Registry Broker

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

APICallook.infoHEALTHY94HOL Registry BrokerHEALTHY94
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%100%
P50 · ms437386
P95 · ms1156913
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data from public FCC ULS records)Unverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Callook.info vs HOL Registry Broker: common questions

Which is more reliable, Callook.info or HOL Registry Broker?

On our scheduled checks, Callook.info leads on measured uptime — Callook.info at 100% versus HOL Registry Broker at 99.02% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Callook.info or HOL Registry Broker?

HOL Registry Broker has the lower median latency in our checks — Callook.info responds in 437 ms versus HOL Registry Broker at 386 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 Callook.info and HOL Registry Broker need an API key?

Callook.info needs no key, while HOL Registry Broker requires a free API key. If you want to start calling without signup, reach for Callook.info first.

Can I call Callook.info and HOL Registry Broker from the browser?

Only Callook.info is browser-friendly — it returns CORS headers over HTTPS. HOL Registry Broker needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Callook.info and HOL Registry Broker free for commercial use?

Callook.info has unclear commercial terms, and HOL Registry Broker 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.