A global IP address is meant to be publicly accessible from the Internet.
A local-scope IP address is not routable to the Internet. This means that if your device is assigned local-scope address, your device will not be able to access the Internet, however you will still be able to access campus network resources. A device that requires access to, or reachability from the Internet should be configured with an global IP address.
The University of Iowa is currently assigned the following global IP address ranges:
188.8.131.52 - 184.108.40.206 2620:0:e50::/44
220.127.116.11 - 18.104.22.168
The University of Iowa currently utilizes the following local-scoped IP address range:
172.16.0.0 - 172.31.255.255 fd9a:2c75:7d0c::/48
10.0.0.0/8 (reserved; see https://itsecurity.uiowa.edu/policies-standards-guidelines/network-and-airspace-policy)
Added for Skype Telephony (HCIS-hosted):