ISO 639-1
ia Interlingua (International Auxiliary Language Association)
· filed 2026-07-18 · click a code to copy
Interlingua (International Auxiliary Language Association) carries the ISO 639-1 two-letter code ia.
In practice this code appears in HTML (<html lang="ia">), HTTP Accept-Language headers, locale identifiers such as ia-XX, subtitle tracks and translation files — anywhere software needs to say “this content is in Interlingua (International Auxiliary Language Association)”.