How many domains are registered in each extension
Counted from published lists and recorded every day, so the change is visible too. For .com, .net, .app and .dev the count comes from the registry’s own zone file, through ICANN’s Centralized Zone Data Service. Country extensions like .co, .io and .ai publish no zone file, so theirs comes from a list compiled by allzonefiles.io, refreshed less often than daily. Either way these are lower bounds on what is registered — close, and never exact. More on the sources.
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| Extension | Registered | Change | As of |
|---|---|---|---|
| .com | 168,848,304 | — | 11 Nov 2026 |
| .net | 12,457,110 | −966 | 10 Nov 2026 |
| .co | 3,165,404 | — | 10 Nov 2026 |
| .app | 1,845,647 | +4,750 | 10 Nov 2026 |
| .io | 1,440,216 | — | 11 Nov 2026 |
| .ai | 1,253,398 | — | 10 Nov 2026 |
| .dev | 822,097 | — | 10 Nov 2026 |
A zone file lists delegated domains. A name that is registered but never pointed anywhere is missing from it, and a name that has dropped can linger in a day-old snapshot. A dash under Change means no change was measured: the first reading, a country extension whose list is not refreshed daily, or a source that served the same snapshot two days running.
Size is not the same question as scarcity. See how much of each extension is left at two to six letters, measured against the registry rather than counted from the zone.