IT:AD:Kerberos:SPN
It's about Kerberos
SPN's are an artifact of Kerberos.
What they are
A service principal name (SPN) is the name by which a client uniquely identifies an instance of a service.
If you install multiple instances of a service on computers throughout a forest, each instance must have its own SPN. A given service instance can have multiple SPNs if there are multiple names that clients might use for authentication. For example, an SPN always includes the name of the host computer on which the service instance is running, so a service instance might register an SPN for each name or alias of its host. For more information about SPN format and composing a unique SPN, see Name Formats for Unique SPNs.