Allied Telesis AT-S63 - Manual (Page 478)

Chapter 25: Internet Group Management Protocol (IGMP) Snooping Commands
478 Section III: Snooping Protocols
 Router IP - The IP address of the multicast router.
Examples
The following command displays the current IGMP parameter settings:
show ip igmp
The following command displays a list of active host nodes connected to
the switch:
show ip igmp hostlist
The following command displays a list of active multicast routers:
show ip igmp routerlist
Equivalent Command
show igmpsnooping
This command does not display the router and host lists. For information,
see “SHOW IGMPSNOOPING” on page 474.