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Built-in Mathematica Symbol

$MachineAddresses

$MachineAddresses
gives a list of strings specifying the current IP addresses associated with the computer on which Mathematica is being run.

$MachineAddresses gives {} if no network address is defined, so that the computer is effectively "off line".

$MachineAddresses will typically give a list with one element for each network adapter on your computer.

If a network configuration is changed, the value of $MachineAddresses may change during the course of a single Mathematica session.

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