| Subgroup | Code |
| Indo-European | IE |
| Albanian | IEA |
| Gheg | IEAA |
| Tosk | IEAB |
| Anatolian | IEB |
| Luwic | IEBA |
| Armenian | IEC |
| Baltic | IED |
| Eastern Baltic | IEDA |
| Western Baltic | IEDB |
| Unclassified Baltic | IEDC |
| Celtic | IEE |
| Continental Celtic | IEEA |
| Insular Celtic | IEEB |
| Brythonic | IEEBA |
| Goidelic | IEEBB |
| Germanic | IEF |
| East Germanic | IEFA |
| Northwest Germanic | IEFB |
| North Germanic | IEFBA |
| East Scandinavian | IEFBAA |
| Danish-Swedish | IEFBAAA |
| Danish-Bokmal | IEFBAAAA |
| Bokmal | IEFBAAAAA |
| Danish | IEFBAAAAB |
| Swedish | IEFBAAAB |
| West Scandinavian | IEFBAB |
| West Germanic | IEFBB |
| High German | IEFBBA |
| German | IEFBBAA |
| Middle German | IEFBBAAA |
| East Middle German | IEFBBAAAA |
| Moselle Franconian | IEFBBAAAB |
| West Middle German | IEFBBAAAC |
| Moselle Franconian | IEFBBAAACA |
| Rhenisch Franconian | IEFBBAAACB |
| Ripuarian Franconian | IEFBBAAACC |
| Upper German | IEFBBAAB |
| Alemannic | IEFBBAABA |
| Bavarian-Austrian | IEFBBAABB |
| Yiddish | IEFBBAB |
| North Sea Germanic | IEFBBB |
| Old English | IEFBBBA |
| Middle English | IEFBBBAA |
| English | IEFBBBAAA |
| Frisian | IEFBBBB |
| Low Saxon | IEFBBBC |
| Low Franconian | IEFBBC |
| Hellenic | IEG |
| Greek | IEGA |
| Attic | IEGAA |
| Doric | IEGAB |
| Macedonian | IEGB |
| Illyrian | IEH |
| Indo-Iranian | IEI |
| Indo-Aryan | IEIA |
| Indo-Aryan Central Zone | IEIAA |
| Bhil | IEIAAA |
| Dom | IEIAAB |
| Gujarati | IEIAAC |
| Khandesi | IEIAAD |
| Panjabi | IEIAAE |
| Rajasthani | IEIAAF |
| Marwari | IEIAAFA |
| Unclassified Rajasthani | IEIAAFB |
| Romani | IEIAAG |
| Balkan Romani | IEIAAGA |
| Northern Romani | IEIAAGB |
| Vlax | IEIAAGC |
| Unclassified Indo-Aryan Central Zone | IEIAAH |
| Western Hindi | IEIAAI |
| Bundeli | IEIAAIA |
| Hindustani | IEIAAIB |
| Sansi | IEIAAIBA |
| Unclassified Western Hindi | IEIAAIC |
| Indo-Aryan East Central Zone | IEIAB |
| Indo-Aryan Eastern Zone | IEIAC |
| Bengali-Assamese | IEIACA |
| Bihari | IEIACB |
| Oriya | IEIACC |
| Unclassified Indo-Aryan Eastern Zone | IEIACD |
| Indo-Aryan Northern Zone | IEIAD |
| Central Pahari | IEIADA |
| Eastern Pahari | IEIADB |
| Garhwali | IEIADC |
| Western Pahari | IEIADD |
| Indo-Aryan Northwestern Zone | IEIAE |
| Dardic | IEIAEA |
| Chitral | IEIAEAA |
| Kashmiri | IEIAEAB |
| Kohistani | IEIAEAC |
| Kunar | IEIAEAD |
| Pashayi | IEIAEADA |
| Shina | IEIAEAE |
| Lahnda | IEIAEB |
| Sindhi | IEIAEC |
| Nuristani | IEIAF |
| Sinhalese-Maldivian | IEIAG |
| Indo-Aryan Southern Zone | IEIAH |
| Konkani | IEIAHA |
| Unclassified Indo-Aryan Southern Zone | IEIAHB |
| Unclassified Indo-Aryan | IEIAI |
| Iranian | IEIB |
| Eastern Iranian | IEIBA |
| Northeast Eastern Iranian | IEIBAA |
| Southeast Eastern Iranian | IEIBAB |
| Pamir | IEIBABA |
| Shugni-Yazgulami | IEIBABAA |
| Pashto | IEIBABB |
| Unclassified Iranian | IEIBB |
| Western Iranian | IEIBC |
| Northwest Western Iranian | IEIBCA |
| Balochi | IEIBCAA |
| Caspian | IEIBCAB |
| Central Iran | IEIBCAC |
| Kurdish | IEIBCAD |
| Ormuri-Parachi | IEIBCAE |
| Semnani | IEIBCAF |
| Talysh | IEIBCAG |
| Zaza-Gorani | IEIBCAH |
| Southwest Western Iranian | IEIBCB |
| Fars | IEIBCBA |
| Luri | IEIBCBB |
| Persian | IEIBCBC |
| Tat | IEIBCBD |
| Unclassified Southwest Western Iranian | IEIC |
| Italic | IEJ |
| Latino-Faliscan | IEJA |
| Latin | IEJAA |
| Romance | IEJAAA |
| Eastern Romance | IEJAAAA |
| Italo-Western | IEJAAAB |
| Italo-Dalmatian | IEJAAABA |
| Western Italo-Western | IEJAAABB |
| Gallo-Iberian | IEJAAABBA |
| Gallo-Romance | IEJAAABBAA |
| Gallo-Italian | IEJAAABBAAA |
| Gallo-Rhaetian | IEJAAABBAAB |
| Oil | IEJAAABBAABA |
| French | IEJAAABBAABAA |
| Southeastern Oil | IEJAAABBAABAB |
| Rhaetian | IEJAAABBAABB |
| Ibero-Romance | IEJAAABBAB |
| East Iberian | IEJAAABBABA |
| Oc | IEJAAABBABB |
| West Iberian | IEJAAABBABC |
| Asturo-Leonese | IEJAAABBABCA |
| Castilian | IEJAAABBABCB |
| Portuguese-Galician | IEJAAABBABCC |
| Pyranean-Mozarabic | IEJAAABBB |
| Mozarabic | IEJAAABBBA |
| Pyranean | IEJAAABBBB |
| Southern Romance | IEJAAAC |
| Corsican | IEJAAACA |
| Sardinian | IEJAAACB |
| Osco-Umbrian | IEJB |
| Unclassified Italic | IEJC |
| Phrygian | IEK |
| Slavic | IEL |
| East Slavic | IELA |
| South Slavic | IELB |
| Eastern South Slavic | IELBA |
| Western South Slavic | IELBB |
| West Slavic | IELC |
| Czech-Slovak | IELCA |
| Lechitic | IELCB |
| Sorbian | IELCC |
| Thracian | IEM |
| Tokharian | IEN |
| Unclassified Indo-European | IEO |