olemus
maksekaardi numbri algusosa,
standardne 6- või 8-kohaline number, mis
määrab üheselt kaardi väljaandja ja ta majandusala
=
the leading 6 or 8 digits of a payment card number that identify the card issuing institution

ülevaateid
https://www.ansi.org/other_services/registration_programs/IIN

https://en.wikipedia.org/wiki/Payment_card_number

https://stevemorse.org/ssn/List_of_Bank_Identification_Numbers.html

standardid
https://www.iso.org/obp/ui/#iso:std:iso-iec:4909:ed-1:v1:en

https://www.iso.org/obp/ui/#iso:std:iso-iec:7812:-1:ed-5:v1:en

https://www.iso.org/news/2016/11/Ref2146.html