You can find your IBAN and BIC in the following places:
In the Kontist app under: Profile (top left)
In the Online Banking under: Profile (top right)
In your account statements, available in the Downloads section:
In the app: Profile > Downloads > Account Statements
In Online Banking: Left sidebar > Downloads > Account Statements
IBAN details
Your IBAN starts with the German country code DE, followed by a two-digit check number, the Solaris SE bank code (110 101 00), and your 10-digit account number.
Your IBAN is generated when your account is opened and cannot be changed later.