range
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... target hosts with the same priority
SHOULD be tried in pseudorandom order. The range is 0-65535.
Weight
...
... the those that have the same priority, the chance of trying this
one first SHOULD be proportional to its weight. The range of
this number is 1-65535. Domain administrators ...
... port on this target host of this service. The range is
0-65535. This is often as specified in Assigned Numbers but
need not be.
...