All of the 2-way, 4-way and 8-way splitters which I have used, have virtually the same loss from input port to each output port. Variations of a few tenths of a dB are insignificant.
Most, but not all 3-way splitters have about 8 dB loss between the input port and two of the output ports. The remaining port has about 4 dB loss relative to the input port.
Occasionally I've seen 6-way splitters offered. As with the 3-way splitters, you would need to read the specifications to be certain what the loss per port is.
A good splitter should be labeled.
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