Vladimir In France, people colloquially call their IBAN or bank account a RIB. The real meaning is actually slightly different, as it's a type of document. It's short for relevé d'identité bancaire which means "statement of banking identity" and it's a document that French banks give you which just lists your IBAN, your name, the name of the bank basically.
The creator of this thread therefore just wanted to know how they can get a sub-account at bunq with a FR IBAN.