Although these encodings are sometimes referred to as ASCII, true ASCII is defined strictly only by the ANSI standard.
ɔːlðˈoʊ ðiːz ɛŋkˈoʊdɪŋz ɑːɹ sˈʌmtaɪmz ɹᵻfˈɜːd tʊ æz ˈæski, tɹˈuː ˈæski ɪz dᵻfˈaɪnd stɹˈɪktli ˈoʊnli baɪ ðɪ ˈænsi stˈændɚd.