Syntax:
SHOW SLAVE HOSTS

Displays a list of replication slaves currently registered with the
master.

The list is displayed on any server (not just the master server). The
output looks like this:

mysql> SHOW SLAVE HOSTS;
+-----------+-----------+-------+-----------+--------------------------------------+
| Server_id | Host      | Port  | Master_id | Slave_UUID                           |
+-----------+-----------+-------+-----------+--------------------------------------+
|  192168010 | iconnect2 | 3306 | 192168011 | 14cb6624-7f93-11e0-b2c0-c80aa9429562 |
| 1921680101 | athena    | 3306 | 192168011 | 07af4990-f41f-11df-a566-7ac56fdaf645 |
+------------+-----------+------+-----------+--------------------------------------+

o Server_id: The unique server ID of the slave server, as configured in
  the server's option file, or on the command line with
  --server-id=value.

o Host: The host name of the slave server, as configured in the
  server's option file, or on the command line with
  --report-host=host_name. Note that this can differ from the machine
  name as configured in the operating system.

o Port: The port the slave server is listening on.

  In MySQL 5.6.5 and later, a zero in this column means that the slave
  port (--report-port) was not set. Prior to MySQL 5.6.5, 3306 was used
  as the default in such cases (Bug #13333431).

o Master_id: The unique server ID of the master server that the slave
  server is replicating from.

o Slave_UUID: The globally unique ID of this slave, as generated on the
  slave and found in the slave's auto.cnf file.

  This column was added in MySQL 5.6.0.

URL: http://dev.mysql.com/doc/refman/5.6/en/show-slave-hosts.html

