ទំព័រគំរូ:Script/doc/id-unk/is-iso-alpha4
Template documentation- Returns input alpha4 when existing, <blank> when not existing (per #default).
- "Special ISO codes" (number 900-999) are NOT recognised here (Qaaa..Qabx, Zinh Zmth Zsye Zsym Zxxx Zyyy Zzzz).
- List of ISO codes as of 2021-02-17 (201 regular codes)
- >Adlm → Adlm
- >Aaaa →