List of active IP in SQM

I am new in OpenWrt and I was going through the code of SQM by tohojo. In the documentation of Making cake sing and dance, on a tight rope without a safety net (aka advanced features), it said that all active IP will get fairness. Where can i see the list of active IP in the ssh? If its not too much, can anyone pinpoint the code and line that makes this list. Thank you in advance.