Port 1 starts at the next MAC after the base chassis MAC. So in your example if the base MAC is 14:9f:43:a3:ad:e8 the ports would be.
14:9f:43:a3:ad:e9 (port 1)
14:9f:43:a3:ad:ea (port 2)
14:9f:43:a3:ad:eb (port 3)
...
14:9f:43:a3:ae:04 (port 28)
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