You have the option to set it as static or DHCP in appliance manager. If you choose DHCP, when you power it up in the new environment you can check the IP with vSphere client. It will show you the IP on the machine's console screen. There is quite a bit of info in the admin guide (chapter 4).
http://www.solarwinds.com/documentation/alertcentral/docs/AlertCentralAdminGuide.pdf