clients association per wireless interface

hello,
I need a list of the MAC address associates per interface wireless, for SNMP this I would be possible? Or only making some script? Need for create web front-end for visualizations.

example:

wlan1
xx:xx:xx:xx:xx
xx:xx:xx:xx:xx
xx:xx:xx:xx:xx
xx:xx:xx:xx:xx

wlan2
xx:xx:xx:xx:xx
xx:xx:xx:xx:xx
xx:xx:xx:xx:xx
xx:xx:xx:xx:xx

wlan3
xx:xx:xx:xx:xx
xx:xx:xx:xx:xx
xx:xx:xx:xx:xx
xx:xx:xx:xx:xx

Thanks