Many universities, such as the University of Dayton, University of Kentucky and University of Pennsylvania, have campus directories on their websites containing such information as campus addresses, phone numbers and email addresses. These institutions have search engines where individuals can look up school members or campus addresses by name.
The University of Pennsylvania also has a more specialized directory search engine for internal use only. Those with a PennKey and password from the university can access the directory.
As the University of Pennsylvania notes on its website, university directories are a public service, and many universities forbid the use of them for solicitation.