by: Paul Horowitz
If you ever find yourself needing to know a history of a specific Macs assigned local IP addresses, you can find this potentially helpful networking information from the command line. This trick will report all local IP addresses which have been used by a Mac, and, very helpfully, it will also offer the specific date and time a given IP address was assigned to the Mac. Yes, this data spans networks and applies even if it’s no longer the active IP of the machine.
If you’re wondering why this may be helpful, IP address history can be invaluable for network troubleshooting purposes like the annoying same IP error, systems and network administration, digital forensics, and likely other tasks as well.