The URI for the endpoint on which a service listens can be set programmatically using the ListenUri property and the value of the ListenUriMode for that endpoint is set using the ListenUriMode property. The default value for ListenUri is Address. The default value for ListenUriMode is Explicit.
When the value of the ListenUriMode is set to Unique the transport is responsible for creating a unique URI. Different transports used by Windows Communication Foundation (WCF) generate this unique URI differently
For TCP in exclusive mode (PortSharingEnabled is false) this means binding to a uniquely available port number.
For TCP in port sharing mode (PortSharingEnabled is true) and for all of the other existing WCF transports, this means appending a unique path (a GUID) to the end of the ListenUri.
When the value of the ListenUriMode is set to Explicit mode, the transport uses the ListenUri exactly as it is provided, without modifying it to make it unique.