The backend is hosted on ibans.es.klump.solutions right now.
A frontend is hosted on iban-gen.klump.solutions.
curl https://ibans.es.klump.solutions/v1/random
or
curl https://ibans.es.klump.solutions/v1/random?bankCode=01009000
or
curl https://ibans.es.klump.solutions/v1/random?bic=BEVODEBBXXX
Check all available BICs with
curl https://ibans.es.klump.solutions/v1/bics