what do you mean ? mask attack (-a 3) ?
there is no such thing as alphanumeric chars in hashcat built-in charsets: we only have the single groups of characters like ?d,?l,?u and the combination of them (together with specials, ?s): ?a
alphanumeric probably would be either using --custom-charset1 ?l?d or --custom-charset1 ?u?d or both cases --custom-charset1 ?l?u?d
You need to be more specif about what you mean.
My best guess would be that you need something like this: https://hashcat.net/faq/morework (e.g. using -S or pipe/stdin as a workaround or similar)
there is no such thing as alphanumeric chars in hashcat built-in charsets: we only have the single groups of characters like ?d,?l,?u and the combination of them (together with specials, ?s): ?a
alphanumeric probably would be either using --custom-charset1 ?l?d or --custom-charset1 ?u?d or both cases --custom-charset1 ?l?u?d
You need to be more specif about what you mean.
My best guess would be that you need something like this: https://hashcat.net/faq/morework (e.g. using -S or pipe/stdin as a workaround or similar)