Allied Telesis AT-S63 - Manual (Page 366)

Chapter 21: MLD Snooping Commands
366 Section III: Snooping Protocols
The following command displays a list of active host nodes connected to
the switch:
show ipv6 mldsnooping hostlist
The following command displays a list of active multicast routers:
show ipv6 mldsnooping routerlist
Equivalent Command
show mldsnooping
For information, see “SHOW MLDSNOOPING” on page 362.