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In order to view the list of IPv6 (inet) DHCP leases currently assigned on your Juniper EX switch you simply need to login to your switch and enter CLI mode.  They type the following command:

run show system services dhcp binding detail

The output of this command should give you a clear list like the example below

IP address        Hardware address   Type     Lease expires            State
123.123.123.123 00:11:aa:aa:11:00 dynamic 2019-05-28 14:24:54 BST active
123.123.123.124 00:11:aa:aa:11:01 dynamic 2019-05-28 14:31:29 BST active
123.123.123.125 00:11:aa:aa:11:02 dynamic 2019-05-26 08:45:09 BST active
123.123.123.126 00:11:aa:aa:11:03 dynamic 2019-05-17 12:32:26 BST active
123.123.123.127 00:11:aa:aa:11:04 dynamic 2019-05-16 12:58:47 BST expired
123.123.123.128 00:11:aa:aa:11:05 dynamic 2019-05-30 16:57:56 BST active
123.123.123.129 00:11:aa:aa:11:06 dynamic 2019-05-16 00:31:42 BST expired
123.123.123.130 00:11:aa:aa:11:07 dynamic 2019-05-17 13:24:52 BST active
123.123.123.131 00:11:aa:aa:11:08 dynamic 2019-05-29 12:01:01 BST active

As you can see above you will get the MAC addresss of the client as well as the current state.  Use the MAC address to search the ethernet-switching table locate the end port that the device is connected via.

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