#### 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 [Function] , machine-version [Function]