Of value only to NetAdmins who have proper authorization. From Michael Hint's "Magic CIT info websites" (9/25/12) email.

CIT IP to jack tool

http://nettrac.cit.cornell.edu/

Page is called, "CIT Network Traffic Analysis Center". It contains two services/ tools:

Usage statistics for individual IP addresses
- Offers both an interactive form, or via a shortcut to get the usage statistics for the computer currently being used.
IP/MAC address tracking tools

DNS/Cname tool

http://dnsdb.cit.cornell.edu/dnsdb-cgi/list_domain.pl

See also

Cornell's email forwarding service