| Kunza | kuz-000 | ckatta |
| Kunza | kuz-000 | cka-tur |
| Pawnee | paw-000 | ckaʼuʼ |
| Kunza | kuz-000 | ckauc-kai-tur |
| Kunza | kuz-000 | ckau-sa-tur |
| Kunza | kuz-000 | ckauscku |
| Kunza | kuz-000 | ckautcha |
| Kunza | kuz-000 | ckauti |
| slovenčina | slk-000 | čkavka |
| Klamath-Modoc | kla-000 | Ck"aw |
| Kunza | kuz-000 | ckaya |
| Kunza | kuz-000 | cka-ya-ri-tur |
| Kunza | kuz-000 | ckayatar |
| Tsimshian | tsi-000 | ckaygg |
| Cha7³¹ tinyan³ | ctz-000 | čkãʔ |
| English | eng-000 | CKB |
| ISO 639-3 | art-001 | ckb |
| ISO 639 | art-005 | ckb |
| filename extensions | art-335 | ckb |
| IETF language tags | art-420 | ckb |
| ISO 639-PanLex | art-274 | ckb-000 |
| ISO 639-PanLex | art-274 | ckb-001 |
| Tsimshian | tsi-000 | ck-ba-shm ʼkaʼkackd |
| TechTarget file types | art-336 | CKB-Borland-C-Keyboard-mapping-file |
| Tsimshian | tsi-000 | ckbeesh |
| Tsimshian | tsi-000 | ckʼbiyaan |
| filename extensions | art-335 | ckbx |
| ISO 639-3 Retired Code Elements | art-324 | ckc |
| English | eng-000 | CKC Chinese Input System |
| ISO 12620 | art-317 | CKCCSender |
| English | eng-000 | CKCCSender |
| ISO 12620 | art-317 | CKCCSenderPid |
| ISO 12620 | art-317 | CKCCZender |
| TechTarget file types | art-336 | CK-ChucK-Source-Code-ChucK-Team |
| English | eng-000 | CKD |
| ISO 639-3 Retired Code Elements | art-324 | ckd |
| filename extensions | art-335 | ckd |
| čeština | ces-000 | ČKD |
| Deutsch | deu-000 | ČKD |
| English | eng-000 | ČKD |
| magyar | hun-000 | ČKD |
| polski | pol-000 | ČKD |
| TechTarget file types | art-336 | CKD-CADKEY-design-file |
| TechTarget file types | art-336 | CKD-CADKEY-Workshop-Design-File-Kubotek-USA-Inc |
| TechTarget file types | art-336 | CKD-KeyCreator-Design-file-Header |
| TechTarget file types | art-336 | CKD-Kubotek-Design-Container |
| Deutsch | deu-000 | ČKD-Praga |
| English | eng-000 | ČKD-Praga |
| Tsimshian | tsi-000 | ckdsoʼotsk |
| Northern Mam | mam-001 | Ck"e |
| ISO 639-3 Retired Code Elements | art-324 | cke |
| la lojban. | jbo-000 | cke |
| Kunza | kuz-000 | cke |
| English | eng-000 | ckeave to |
| la lojban. | jbo-000 | ckecaura'udarsi |
| English | eng-000 | ckeck off |
| English | eng-000 | ckecks |
| Loglan | jbo-001 | ckecoa |
| Kunza | kuz-000 | ckec-tchi |
| Taqbaylit | kab-000 | ckedʼ |
| Loglan | jbo-001 | ckedui |
| Kunza | kuz-000 | ckees |
| Thavung | thm-000 | ckEEŋ² |
| Loglan | jbo-001 | ckefao |
| Waviare | mbr-000 | Ckei |
| Kunza | kuz-000 | ckein-cha |
| Kunza | kuz-000 | ckein-tcha |
| Kunza | kuz-000 | ckeitin |
| la lojban. | jbo-000 | ckeji |
| Malti | mlt-000 | ckejken |
| Amis | ami-000 | ckel |
| Loglan | jbo-001 | ckela |
| Loglan | jbo-001 | ckelaa |
| Loglan | jbo-001 | ckelagmao |
| Kunza | kuz-000 | ckelar |
| Kunza | kuz-000 | ckeleutch-auɲa |
| Kunza | kuz-000 | ckeleya |
| Kunza | kuz-000 | ckelinar |
| Loglan | jbo-001 | ckelisfre |
| Loglan | jbo-001 | ckelisgoi |
| Loglan | jbo-001 | ckelispri |
| Loglan | jbo-001 | ckelista |
| Loglan | jbo-001 | ckelisvalda |
| Loglan | jbo-001 | ckelisybuu |
| shqip | sqi-000 | çkëlqim |
| Loglan | jbo-001 | ckemei |
| Loglan | jbo-001 | ckemo |
| Fox | sac-001 | -`ckenä- |
| Kunza | kuz-000 | ckénia |
| Kunza | kuz-000 | cken-ni |
| Kunza | kuz-000 | ckenni |
| Loglan | jbo-001 | ckenorbro |
| Kunza | kuz-000 | ckentchockol |
| Taqbaylit | kab-000 | ckenttedh |
| Loglan | jbo-001 | ckenurhui |
| Kunza | kuz-000 | ckepar |
| Kunza | kuz-000 | ckepe |
| Loglan | jbo-001 | ckepea |
| Kunza | kuz-000 | ckepi |
| Kunza | kuz-000 | ckepi-ckati |
| Kunza | kuz-000 | ckepipui |
| Kunza | kuz-000 | ckepi-sinna |
| Kunza | kuz-000 | ckep-ni-tur |
| Kunza | kuz-000 | ckeppar |
| Kunza | kuz-000 | cker-an-tur |
| Loglan | jbo-001 | ckerao |
| Cha7³¹ tinyan³ | ctz-000 | čʼkeru |
| English | eng-000 | C. Kesavan |
| toskërishte | als-000 | çkëshilloj |
| Loglan | jbo-001 | ckesifmei |
| Kunza | kuz-000 | ckes-tur |
| Kunza | kuz-000 | cketchir |
| Loglan | jbo-001 | cketeu |
| Kunza | kuz-000 | cketi |
| English | eng-000 | cket interleaving |
| Kunza | kuz-000 | ckeu |
| Kunza | kuz-000 | ckeu-tur |
| Loglan | jbo-001 | ckevea |
| Loglan | jbo-001 | ckevei |
| C_Kewa | paa-001 | C_Kewa |
| English | eng-000 | C++ Keyboard Script |
| Kato | ktw-000 | =čk-eʔ |
| Kato | ktw-000 | =čʼk-eʔ |
| ISO 639-3 Retired Code Elements | art-324 | ckf |
| filename extensions | art-335 | ckf |
| TechTarget file types | art-336 | CKF-Casio-Keyboard-File |
| ISO 639-3 | art-001 | ckh |
| ISO 639-PanLex | art-274 | ckh-000 |
| Proto-Tai | tai-000 | *C-kha.C |
| Ethnologue Language Names | art-330 | Ckhala |
| Wichita | wic-000 | ckha:r |
| Hmoob | hnj-000 | ckhob tswb |
| tiếng Việt | vie-000 | c khối |
| Wichita | wic-000 | ckh~or |
| pʼurhépecha uantakua | tsz-000 | Ckh~uri |
| Fox | sac-001 | -`cki- |
| UNDP Country Codes | art-294 | CKI |
| mundaŋ | mua-000 | CKI |
| ISO 639-3 Retired Code Elements | art-324 | cki |
| filename extensions | art-335 | cki |
| la lojban. | jbo-000 | cki |
| Wichita | wic-000 | cki |
| Mashco Piro | cuj-000 | c̷ki |
| Cha7³¹ tinyan³ | ctz-000 | čkĩ |
| Kunza | kuz-000 | ckibur |
| Alsea | aes-000 | cki*ci |
| Malti | mlt-000 | ckien |
| Northern Sinkyone | wlk-003 | c.kiiH |
| Kunza | kuz-000 | cki-i-tur |
| la lojban. | jbo-000 | ckiku |
| Kunza | kuz-000 | ckilapana |
| Kunza | kuz-000 | ckilir |
| Kunza | kuz-000 | ckilli |
| la lojban. | jbo-000 | ckilu |
| Southern Cakchiquel San Andres Itzapa | cak-003 | c"kin |
| Western Cakchiquel Patzun | cak-004 | c"kin |
| Tzutujil Santiago Atitlan | tzj-001 | c"kin |
| Lazuri | lzz-000 | çkin |
| Wichita | wic-000 | ckinc |
| Wichita | wic-000 | ckincha |
| la lojban. | jbo-000 | ckini |
| anicinâbemowin | alq-000 | ckinjik |
| TechTarget file types | art-336 | CKI-Off-by-One-Browser-Persistent-HTTP-Cookies |
| Kunza | kuz-000 | ckipti |
| Kunza | kuz-000 | ckip-tur |
| Mashco Piro | cuj-000 | čkipɨ |
| azərbaycanca | azj-000 | ckir |
| Kunza | kuz-000 | ckir-ckir |
| la lojban. | jbo-000 | ckire |
| la lojban. | jbo-000 | ckire, jilra |
| Pawnee | paw-000 | ckiríhki |
| Nuxálk | blc-000 | c̷ˀk-is |
| Nuxálk | blc-000 | c̷ḳˀ-is |
| toskërishte | als-000 | çkishërim |
| toskërishte | als-000 | çkishëroj |
| Kunza | kuz-000 | ckist-cha-tur |
| Kunza | kuz-000 | ckisti |
| Kunza | kuz-000 | ckitche |
| Kunza | kuz-000 | ckito |
| Kunza | kuz-000 | ckitti |
| anicinâbemowin | alq-000 | -ckiwe |
| ISO 639-3 Retired Code Elements | art-324 | ckj |
| ISO 639-3 Retired Code Elements | art-324 | ckk |
| ISO 639-3 | art-001 | ckl |
| ISO 639-PanLex | art-274 | ckl-000 |
| Deutsch | deu-000 | C-Klasse |
| Peace Corps 2007 Tamazight | tzm-009 | cklat |
| svenska | swe-000 | C-klav |
| français | fra-000 | CKLD |
| English | eng-000 | CKLD-FM |
| français | fra-000 | CKLE |
| English | eng-000 | CKLE-FM |
| Nederlands | nld-000 | c-klein |
| polski | pol-000 | ckliwica |
| polski | pol-000 | ckliwie |
| polski | pol-000 | ckliwość |
| polski | pol-000 | ckliwy |
| українська | ukr-000 | ckljʼankə |
| suomi | fin-000 | c-klorofylli |
| English | eng-000 | CKLX-FM |
| English | eng-000 | CKM |
| polski | pol-000 | CKM |
| ISO 639-3 | art-001 | ckm |
| polski | pol-000 | ckm |
| ISO 639-PanLex | art-274 | ckm-000 |
| ISO 639-3 | art-001 | ckn |
| ISO 639-PanLex | art-274 | ckn-000 |
| kaszëbsczi jãzëk | csb-000 | cknąc |
| English | eng-000 | C. K. Nayudu |
| polski | pol-000 | cknić się komuś |
| Fox | sac-001 | -`ckō- |
| English | eng-000 | CKO |
| mundaŋ | mua-000 | Cko |
| Ñomndaa | amu-000 | cko |
| ISO 639-3 | art-001 | cko |
| filename extensions | art-335 | cko |
| la lojban. | jbo-000 | cko |
| čeština | ces-000 | ČKO |
| Tangkhul | nmf-000 | č-ko |
| ISO 639-PanLex | art-274 | cko-000 |
| Kunza | kuz-000 | ckockops |
| Kunza | kuz-000 | ckocku |
| Loglan | jbo-001 | ckodou |
| Loglan | jbo-001 | ckofro |
| English | eng-000 | C. K. Ogden |
| suomi | fin-000 | C. K. Ogden |
| bahasa Indonesia | ind-000 | C. K. Ogden |
| Bahasa Malaysia | zsm-000 | C. K. Ogden |
| Kunza | kuz-000 | ckoi |
| Kunza | kuz-000 | ckoiba |
| Kunza | kuz-000 | ckoicks-tur |
| français | fra-000 | CKOI FM |
| English | eng-000 | CKOI-FM |
| Kunza | kuz-000 | ckoi-man |
| Kunza | kuz-000 | ckoimar |
| Kunza | kuz-000 | ckoi-ma-tur |
| Kunza | kuz-000 | ckois-tur |
| Kunza | kuz-000 | ckoitchi |
| Kunza | kuz-000 | ckoi-tur |
| Kunza | kuz-000 | ckoi-yi |
| Kunza | kuz-000 | ckoi-yo-tur |
| Kĩmĩrũ | mer-000 | ckoka |
| toskërishte | als-000 | çkoklavis |
| TechTarget file types | art-336 | CKO-KnockOut-2-Image-Mask-Corel |
| Kunza | kuz-000 | ckol |
| Kunza | kuz-000 | cko-las |
| Kunza | kuz-000 | ckol-back-tur |
| Kunza | kuz-000 | ckolck-tur |
| Kunza | kuz-000 | ckolck-ul |
| toskërishte | als-000 | çkolis |
| Bangi | bni-000 | ckololo |
| toskërishte | als-000 | çkoloroj |
| Kunza | kuz-000 | ckomal |
| Deutsch | deu-000 | C-Kommando |
| Obispeño | obi-000 | ckomo |
| Deutsch | deu-000 | C-Kompilierer |
| Kunza | kuz-000 | cko-na-tur |
| Bangi | bni-000 | ckõngele |
| Kunza | kuz-000 | ckonicks |
| polski | pol-000 | C-koniec |
| Kunza | kuz-000 | ckonni |
| Kunza | kuz-000 | ckonnir |
| Kunza | kuz-000 | ckonnti |
| Kunza | kuz-000 | ckonn-tur |
| Kunza | kuz-000 | ckonte |
| Kunza | kuz-000 | ckonti |
| Kunza | kuz-000 | ckoockops |
| Lingít | tli-000 | -čkóol |
| Kunza | kuz-000 | ckooli |
| Kunza | kuz-000 | ckools |
| Kunza | kuz-000 | ckooyo |
| Thavung | thm-000 | ckOOŋ² |
| Western Cakchiquel Patzun | cak-004 | Ckop |
| Semai | sea-000 | Ckop |
| Kunza | kuz-000 | cko-pa-cko-tur |
| toskërishte | als-000 | çkopsit |
| x̌ik zik | wbl-000 | ckör |
| Esperanto | epo-000 | C-kordo |
| Kunza | kuz-000 | cko-rin |
| Kunza | kuz-000 | ckorinta |
| Kunza | kuz-000 | ckosc-ka-tur |
| Kunza | kuz-000 | ckoscko |
| Kunza | kuz-000 | ckotchi |
| Kunza | kuz-000 | ckot-cko |
| Kunza | kuz-000 | ckot-na-tur |
| Mashco Piro | cuj-000 | čko-tɨ |
| Kunza | kuz-000 | cko-yu |
| Loglan | jbo-001 | ckozu |
| filename extensions | art-335 | ckp |
| TechTarget file types | art-336 | CKP-Ingres-Checkpoint-File-Computer-Associates-International-Inc |
| TechTarget file types | art-336 | CKP-Ingres-Dbase-Checkpoint-data |
| Deutsch | deu-000 | C. K. Prahalad |
| English | eng-000 | C. K. Prahalad |
| suomi | fin-000 | C. K. Prahalad |
| TechTarget file types | art-336 | CKP-Valise-Secure-Archive-file |
| ISO 639-3 | art-001 | ckq |
| ISO 639-PanLex | art-274 | ckq-000 |
| English | eng-000 | CKR |
| ISO 639-3 | art-001 | ckr |
| Peace Corps 2007 Tamazight | tzm-009 | ckr |