I want send a wire from IB to another broker, but broker is asking what is IBAN from sender account

When IB send a wire transfer (euro), they use same IBAN for all clients ?

The sender is me or interactive brokers ?

 

Look up ACATS

 

In Europe in the Euro zone all bankaccounts have an unique IBAN number.
So maybe IB has an IBAN number and you might have one too. But your account should be in Europe I think. the US uses another system.

https://remitr.com/blog/what-are-iban-codes-what-countries-use-them/