# List Binary Categories

You can use the `BinaryCatList` action to view a list of all the binary categories in the system. For details on this action, refer to the IDOL Server Reference. For example:

    http://12.3.4.56:9020/action=BinaryCatList

This action uses port `9020` to instruct the IDOL Category component, which is located on a machine with the IP address `12.3.4.56`, to list all the binary categories in the system.

_FT_HTML5_bannerTitle.htm