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