Você pode usar (testado no Ubuntu 18.04):
targetcli sessions detail
Será lançado como:
alias: sid: 8 type: Normal session-state: LOGGED_IN
name: iqn.1991-05.com.microsoft:srvr01 (NOT AUTHENTICATED)
mapped-lun: 0 backstore: block/storage01 mode: rw
address: 10.0.0.11 (TCP) cid: 1 connection-state: LOGGED_IN
alias: sid: 9 type: Normal session-state: LOGGED_IN
name: iqn.1991-05.com.microsoft:srvr02 (NOT AUTHENTICATED)
mapped-lun: 0 backstore: block/storage01 mode: rw
address: 10.0.0.12 (TCP) cid: 1 connection-state: LOGGED_IN
alias: sid: 10 type: Normal session-state: LOGGED_IN
name: iqn.1991-05.com.microsoft:srvr03 (NOT AUTHENTICATED)
mapped-lun: 0 backstore: block/storage01 mode: rw
address: 10.0.0.13 (TCP) cid: 1 connection-state: LOGGED_IN