Linux / UNIX Command To Find Out Who Owns a Domain Name

How do I find out who owns a Internet domain name and its ip address?

The WHOIS system is used by domains and ip address on the Internet. It is used by system administrators to obtain contact information for IP address assignments or domain name administrators. Use whois command as follows:
$ whois domain-name
$ whois -h whois.example.com domain.com
$ whois google.com
Sample outputs:

Registrant:
        Dns Admin
        Google Inc.
        Please contact contact-admin@google.com 1600 Amphitheatre Parkway
         Mountain View CA 94043
        US
        dns-admin@google.com +1.6502530000 Fax: +1.6506188571
    Domain Name: google.com
        Registrar Name: Markmonitor.com
        Registrar Whois: whois.markmonitor.com
        Registrar Homepage: http://www.markmonitor.com
    Administrative Contact:
        DNS Admin
        Google Inc.
        1600 Amphitheatre Parkway
         Mountain View CA 94043
        US
        dns-admin@google.com +1.6506234000 Fax: +1.6506188571
    Technical Contact, Zone Contact:
        DNS Admin
        Google Inc.
        2400 E. Bayshore Pkwy
         Mountain View CA 94043
        US
        dns-admin@google.com +1.6503300100 Fax: +1.6506181499
    Created on..............: 1997-09-15.
    Expires on..............: 2011-09-13.
    Record last updated on..: 2010-03-30.

Find out IP address and its owner:
$ host -t a google.com
Sample outputs:
google.com has address 209.85.231.104
Now, get ip address information:
$ whois 209.85.231.104
Sample outputs:

NetRange:       209.85.128.0 - 209.85.255.255
 CIDR:           209.85.128.0/17
 OriginAS:
 NetName:        GOOGLE
 NetHandle:      NET-209-85-128-0-1
 Parent:         NET-209-0-0-0-0
 NetType:        Direct Allocation
 NameServer:     NS2.GOOGLE.COM
 NameServer:     NS3.GOOGLE.COM
 NameServer:     NS4.GOOGLE.COM
 NameServer:     NS1.GOOGLE.COM
 RegDate:        2006-01-13
 Updated:        2006-06-01
 Ref:            http://whois.arin.net/rest/net/NET-209-85-128-0-1OrgName:        Google Inc.
 OrgId:          GOGL
 Address:        1600 Amphitheatre Parkway
 City:           Mountain View
 StateProv:      CA
 PostalCode:     94043
 Country:        US
 RegDate:        2000-03-30
 Updated:        2009-08-07
 Ref:            http://whois.arin.net/rest/org/GOGL

OrgTechHandle: ZG39-ARIN
 OrgTechName:   Google Inc
 OrgTechPhone:  +1-650-253-0000
 OrgTechEmail:  arin-contact@google.com
 OrgTechRef:    http://whois.arin.net/rest/poc/ZG39-ARIN

#
 # ARIN WHOIS data and services are subject to the Terms of Use
 # available at: https://www.arin.net/whois_tou.html
 #