The target name is either an IQN name or an EUI name.

The IQN and EUI names use specific formats.

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The IQN name uses the following format. 

iqn.yyyy-mm.{reversed domain name}:id_string

The following IQN name contains example values. 

iqn.2007-05.com.mydomain:storage.tape.sys3.abc

The ESXi host generates an IQN name for software iSCSI and dependent hardware iSCSI adapters. You can change that default IQN name.

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The EUI name is described in IETF rfc3720 as follows.

The IEEE Registration Authority provides a service for assigning globally unique identifiers [EUI]. The EUI-64 format is used to build a global identifier in other network protocols. For example, Fibre Channel defines a method of encoding it into a WorldWideName.

The format is eui. followed by an EUI-64 identifier (16 ASCII-encoded hexadecimal digits).

The following EUI name contains example values. 

Type EUI-64 identifier (ASCII-encoded hexadecimal)
+- -++--------------+
|   ||              |
eui.02004567A425678D

The IEEE EUI-64 iSCSI name format can be used when a manufacturer is registered with the IEEE Registration Authority and uses EUI-64 formatted worldwide unique names for its products.

You can check in the UI of the storage array whether an array uses an IQN name or an EUI name.