Every unregistered three-letter .si name, re-checked twice a day at the registry, with the letter pattern on each and appraisal, search demand and footprint where we have them.
There are 17,576 possible three-letter names in .si, the extension AI ventures adopted in 2026 as "SI", Super Intelligence. Every two-letter .si is already registered; the three-letter class is the last finite one, the way LLL.ai was before it ran out in August 2026. 787 are still unregistered today. We re-check twice a day at the registry and keep, for each free name, its letter pattern (Western and Chinese premium letters, repeats) and, as we add them, our Engine v3 appraisal, measured search demand and the number of extensions the three letters are already registered in. Sort, filter and export the whole list. Any active plan unlocks it.
Since we started tracking on 30 Sep 2026, 4,958 names have been registered.
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