You can usually get a very detailed profile and contact information if you use the whois command on a dedicated whois server. I personally use networksolutions.com whois server. For example:

Code:
# whois [email protected]

[whois.networksolutions.com]
NOTICE AND TERMS OF USE: You are not authorized to access or query our WHOIS
database through the use of high-volume, automated, electronic processes. The
Data in VeriSign's WHOIS database is provided by VeriSign for information
purposes only, and to assist persons in obtaining information about or related
to a domain name registration record. VeriSign does not guarantee its accuracy.
By submitting a WHOIS query, you agree to abide by the following terms of use:
You agree that you may use this Data only for lawful purposes and that under no
circumstances will you use this Data to: (1) allow, enable, or otherwise support
the transmission of mass unsolicited, commercial advertising or solicitations
via e-mail, telephone, or facsimile; or (2) enable high volume, automated,
electronic processes that apply to VeriSign (or its computer systems). The
compilation, repackaging, dissemination or other use of this Data is expressly
prohibited without the prior written consent of VeriSign. You agree not to use
high-volume, automated, electronic processes to access or query the WHOIS
database. VeriSign reserves the right to terminate your access to the WHOIS
database in its sole discretion, including without limitation, for excessive
querying of the WHOIS database or for failure to otherwise abide by this policy.
VeriSign reserves the right to modify these terms at any time.


Registrant:
John Vranesevich (ANTIONLINE2-DOM)
   605 Third Street
   Beaver, PA 15009
   US

   Domain Name: ANTIONLINE.COM

   Administrative Contact, Technical Contact:
      Vranesevich, John  (VJ288)                [email protected]
      AntiOnline
      605 Third Street
      Beaver, PA  15009
      US
      724-773-0940 724-773-0941

   Record expires on 04-Sep-2005.
   Record created on 05-Sep-1997.
   Database last updated on 2-Jan-2003 16:37:06 EST.

   Domain servers in listed order:

   NS.ANTIONLINE.NET            63.108.181.242
   NS2.ANTIONLINE.NET           63.108.181.243
Incidentally, that's not an email address at the top on the command line. I can't disable the email address parsing. Anyway, you use the "@" sign to denote the whois server you want to use.