What is IRC code in bank acc info?

[Bomber]

I try to fill my bank information to receive payments from steam workshop but now I dont know what IRC code is. This field is necessary (marked with *). Country is New Zealand. (IRC-code - a bank identification code to determine how funds will be transferred to your bank. This field must contain exactly 6 characters.) I made a call to my bank but they have no idea what it is as well.

[Darren]

https://help.anz.co.nz/app/answers/detail/a_id/97/~/receive-an-overseas-payment

In short use the first 6 digits of your account number (the BSB).