Shell Script To Get Data Center Information, IP Owner, City and Country From Domain Name

#!/bin/bash
# A sample shell script to print domain ip address hosting information such as
# Location of server, city, ip address owner, country and network range.
# This is useful to track spammers or research purpose.
# -------------------------------------------------------------------------
# Copyright (c) 2006 nixCraft project <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# Last updated on Mar/05/2010
# -------------------------------------------------------------------------
 
# Get all domains
_dom=$@
 
# Die if no domains are given
[ $# -eq 0 ] && { echo "Usage: $0 domain1.com domain2.com ..."; exit 1; }
for d in $_dom
do
	_ip=$(host $d | grep 'has add' | head -1 | awk '{ print $4}')
	[ "$_ip" == "" ] && { echo "Error: $d is not valid domain or dns error."; continue; }
	echo "Getting information for domain: $d [ $_ip ]..."
	whois "$_ip" | egrep -w 'OrgName:|City:|Country:|OriginAS:|NetRange:'
	echo ""
done

Run script as follows:
./script.sh cyberciti.biz google.com
Sample outputs:

Getting information for domain: cyberciti.biz [ 74.86.48.99 ]...
OrgName:    SoftLayer Technologies Inc.
City:       Dallas
Country:    US
NetRange:   74.86.0.0 - 74.86.255.255
OriginAS:   AS36351
Getting information for domain: google.com [ 209.85.231.104 ]...
OrgName:    Google Inc.
City:       Mountain View
Country:    US
NetRange:   209.85.128.0 - 209.85.255.255