Redhat / CentOS: Install Internet whois / nicname Client

How do I install whois client to see whois information about domain and ip address using command line options under Fedora / RHEL / Redhat / CentOS / Scientific Linux?

jwhois is a whois client that accepts both traditional and finger-style queries under RHEL. You can install the same using the yum command. Login as root and type the following command to install the jwhois client:
# yum -y install jwhois
Sample outputs:

Loaded plugins: priorities, rhnplugin
70 packages excluded due to repository priority protections
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package jwhois.x86_64 0:4.0-18.el6 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
 Package      Arch         Version             Repository                  Size
================================================================================
Installing:
 jwhois       x86_64       4.0-18.el6          rhel-x86_64-server-6       104 k
Transaction Summary
================================================================================
Install       1 Package(s)
Upgrade       0 Package(s)
Total download size: 104 k
Installed size: 0
Downloading Packages:
jwhois-4.0-18.el6.x86_64.rpm                             | 104 kB     00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : jwhois-4.0-18.el6.x86_64                                 1/1
Installed:
  jwhois.x86_64 0:4.0-18.el6
Complete!

You can use the whois command as follows:
$ whois cyberciti.biz
$ whois 75.126.153.206
Sample outputs:

[Querying whois.arin.net]
[Redirected to rwhois.softlayer.com:4321]
[Querying rwhois.softlayer.com]
[rwhois.softlayer.com]
%rwhois V-1.5:003fff:00 rwhois.softlayer.com (by Network Solutions, Inc. V-1.5.9.5)
network:Class-Name:network
network:ID:NETBLK-SOFTLAYER.75.126.128.0/19
network:Auth-Area:75.126.128.0/19
network:Network-Name:SOFTLAYER-75.126.128.0
network:IP-Network:75.126.153.200/29
network:IP-Network-Block:75.126.153.200-75.126.153.207
network:Organization;I:SoftLayer Technologies, Inc.
network:Street-Address:1950 Stemmons Freeway Suite 2043
network:City:Dallas
network:State:TX
network:Postal-Code:75207
network:Country-Code:US
network:Tech-Contact;I:sysadmins@softlayer.com
network:Abuse-Contact;I:abuse@softlayer.com
network:Admin-Contact;I:IPADM258-ARIN
network:Created:20070218
network:Updated:20091220
network:Updated-By:ipadmin@softlayer.com
%referral rwhois://root.rwhois.net:4321/auth-area=.
%ok