.io
2 claimants
2 primary
0 secondary
shared primary (2)
SWH popularity
From the SWH-MSR-ARV dataset (Desmazières, Di Cosmo, Lorentz, MSR 2025; file nb_extensions_alphanum.csv) — one row per (ext, year) in the full SWH archive. Case-aggregated. citation.
50.3K
total occurrences
10.0K
since 2019 (19.9%)
1979–2023
years active
Case variants in archive: .io (49.7K), .IO (426), .Io (116) — aggregated above.
Attribution status
This extension is attributed to Io; Io; Io (programming language) as primary by 3 authoritative claims.
Claimants (3)
Languages that list
.io among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| Io | linguist | primary |
| Io | pygments | primary |
| Io (programming language) | pygments | primary |
Wikidata says… (2)
File formats, image formats, audio codecs and other non-PL
entities that claim
.io on Wikidata
(property P1195) or in the Wikipedia infobox.
Source: data/derived/external_extension_index.csv.
Click Use as new PL on any row to open the
Add-PL form pre-filled with that entry's name, Wikipedia/Wikidata
URL, and this extension — one submission creates the PL + claim.
| Format | Class (Wikidata P31) | Suggested label | MIME | Notes | Action |
|---|---|---|---|---|---|
| Braveheart game data archive Q105857696 file format | file format | — | application/octet-stream | — | Use as new PL ↗ |
| Io source code file Q129825037 file format | file format | — | text/x-iosrc | — | Use as new PL ↗ |
SWH-mined examples (0)
No archived examples for .io in our local mirror yet.