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#### 25.2.26 machine-instance [Function]

`machine-instance` <no arguments> ⇒ description

#### Arguments and Values::

description—a string or nil.

#### Description::

Returns a string that identifies the particular instance of the computer hardware on which Common Lisp is running, or nil if no such string can be computed.

#### Examples::

     (machine-instance)
    ⇒  "ACME.COM"
    OR⇒ "S/N 123231"
    OR⇒ "18.26.0.179"
    OR⇒ "AA-00-04-00-A7-A4"

#### Affected By::

The machine instance, and the implementation.

#### See Also::

machine-type , machine-version