is a string that gives, if possible, a unique identification code for the computer on which the Wolfram System is being run.


$MachineID
is a string that gives, if possible, a unique identification code for the computer on which the Wolfram System is being run.
Details

- On many computers, $MachineID is the MathID string printed by the external program mathinfo.
- $MachineID is used as part of the license activation process.
Examples
Basic Examples (1)
Check the value of $MachineID:
Tech Notes
Related Guides
History
Introduced in 1991 (2.0)
Text
Wolfram Research (1991), $MachineID, Wolfram Language function, https://reference.wolfram.com/language/ref/$MachineID.html.
CMS
Wolfram Language. 1991. "$MachineID." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/$MachineID.html.
APA
Wolfram Language. (1991). $MachineID. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/$MachineID.html
BibTeX
@misc{reference.wolfram_2025_$machineid, author="Wolfram Research", title="{$MachineID}", year="1991", howpublished="\url{https://reference.wolfram.com/language/ref/$MachineID.html}", note=[Accessed: 08-August-2025]}
BibLaTeX
@online{reference.wolfram_2025_$machineid, organization={Wolfram Research}, title={$MachineID}, year={1991}, url={https://reference.wolfram.com/language/ref/$MachineID.html}, note=[Accessed: 08-August-2025]}