...
MACE has delegated the operation of the namespace urn:mace:rice.edu to Information Technology at Rice University. This namespace supports the assignment of unique, global, persistent names to Rice-specific resources such as that may be used for authorization by Shibboleth and LDAP.
Questions regarding registrations under urn:mace:rice.edu, including requests for new registrations, should be made via help@rice.edu.
...