.der
1 claimant
0 primary
0 secondary
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.
185.3K
total occurrences
29.1K
since 2019 (15.7%)
1970–2023
years active
Case variants in archive: .der (185.2K), .DER (143), .Der (3) — aggregated above.
Attribution status
This extension is attributed to Distinguished Encoding Rules — every claim across all sources (including secondary ones) points to a single language.
Authoritative sources: ✗ Linguist · no claim ✗ Pygments · no claim ✗ Wikidata · no claim ✗ Wikipedia · no claim
Claimants (1)
Languages that list
.der among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| Distinguished Encoding Rules | heuristic:wikidata_keyword_pl_shape | proposed |
Wikidata says… (2)
File formats, image formats, audio codecs and other non-PL
entities that claim
.der 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 |
|---|---|---|---|---|---|
| Distinguished Encoding Rules Q28600469 binary serialization of ASN.1 format | file format; data serialization format | — | — | — | Use as new PL ↗ |
| DER encoded X509 Certificate Q105855892 file format | file format | — | — | — | Use as new PL ↗ |
SWH-mined examples (0)
No archived examples for .der in our local mirror yet.