4-letter .io domains that are still available

4 letters is 456,976 possible .io names. The .io zone file lists 66,659 of them as registered, so about 390,317 are not — an estimate rather than a bound, since a zone misses a registration nobody pointed anywhere and keeps listing names that have since dropped. The names below are the exception: each was confirmed with a registrar.

Find your own

Nobody can search 456,976 names at once; the largest plan here checks 10,000 in a run. What works is taking a corner of the space at a time: fix the first 2 letters and cross them with every two-letter ending, which is 676 combinations and runs on a free account.

Change the opening to move somewhere else in the 456,976. Nothing runs until you click search.