example of a "websurfer" from Chevron:
canonical name chvpkproxy3.chevron.com.
Chevron provides access to the web by proxy from a network that includes these addresses:
188.8.131.52/15, 184.108.40.206/13, 220.127.116.11/14, 18.104.22.168/13, 22.214.171.124/15, 126.96.36.199/16
Their domain is registered with Network Solutions:
6001 Bollinger Canyon Rd.
San Ramon, CA 94583-2324
more about Chevron Corporation