The Blue card for the construction industry has been replaced with the white card.
The Blue card is still valid if you hold one and can be used Australia wide just like the white card.
However if you lose your blue card you can’t get a new one.
There are no longer any organisations in Australia that issue the blue card. So you will not be able to find your blue card number and get a new card.
If you lose your blue card the only option is to do the course for the National White Card. This can be done quickly and easily through White Card Online. The course takes about 4 hours and you can print out a certificate to use while you are waiting for your card to arrive in the post. You will also need to send in some paperwork to confirm that it was you who did the course.
If you live in Qld you will receive a QLD white card that can be used Australia wide.