IQN (iSCSI qualified name) – Can be up to 255 characters long and has the following format:

A.
iqn.<year-mo>.<unique_name>:<reversed_domain_name>,where <year-mo> represents the year and month your domain name was registered, <reversed_domain_name>

B.
iqn.<year-mo>.<reversed_domain_name>:<unique_name>,where <year-mo> represents the year and month your domain name was registered, <reversed_domain_name>

C.
iqn.<year-mo>.< unique_name>.<reversed_domain_name>,where <yea-rmo> represents the year and month your domain name was registered, <reversed_domain_name>

D.
iqn.<year-mo>.<reversed_domain_name>.<unique_name>,where <year-mo>
represents the year and month your domain name was registered, <reversed_domain_name>

Explanation:

IQN (iSCSI qualified name) – Can be up to 255 characters long and has the following format: iqn.<year-mo>.<reversed_domain_name>:<unique_name>,where <year-mo> represents the year and month your domain name was registered, <reversed_domain_name> is the official domain name, reversed, and <unique_name> is any name you want to use, for example, the name of your server.
An example might be iqn.1998-01.com.mycompany:myserver.