Final answer:
The 'setspn' command line utility is used to change a Service Principal Name (SPN) in Microsoft's Active Directory. It provides an interface to alter the way services authenticate with each other.
Step-by-step explanation:
The command line utility that can be used to change a Service Principal Name (SPN) is setspn. This is a Microsoft command line tool used primarily for managing SPNs for Windows computers in Active Directory. The syntax you would use to change an SPN would be 'setspn -a {serviceclass}/{host}:{port} {accountname}'. Here, 'serviceclass' is the type of service, 'host' is the name of the computer hosting the service, 'port' is the port number (optional), and 'accountname' is the name of the account for which the SPN is set.
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