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Comment: specify IPv4 support.


If you are unable to resolve a Handle URL from our MARC records (e.g., you will need to add the domain '' to your firewall's allowlist.

IP Authentication

The University of Michigan campus backbone, on which Fulcrum is hosted, does not support IPv6 at this time. Please continue to send us your IPv4 ranges for basic authentication.

Shibboleth / OpenAthens / SSO