Hi and welcome to Digi Forums.
The IP Address can be changed via the web interface, see the user guide here: https://www.digi.com/resources/documentation/digidocs/90000583/default.htm
As well as command line, see the user guide here: https://ftp1.digi.com/support/documentation/90001535.htm
You can also use Digi Device Discovery: https://ftp1.digi.com/support/utilities/40002256_H.exe
Be aware of this in case the tool would not work: https://www.digi.com/support/knowledge-base/device-discovery-troubleshooting-tips
For any further support, please contact our Technical Support team at firstname.lastname@example.org
Digi Technical Support Engineer