Does some lookups to help find out where a machine or domain is hosted, given a dns name or IP address.

where-is-it-hosted.sh

#!/bin/bash


# Show some help
if (( $# != 1 )); then
  echo ""
  echo "Usage: $(basename $0) <domain.com>"
  echo "Does some lookups to help find out where a website is hosted, given a domain name."
  echo ""
  exit 1
fi

STOPPERS=''
type dig >/dev/null 2>&1 || { STOPPERS="$STOPPERS
 dig"; }
type host >/dev/null 2>&1 || { STOPPERS="$STOPPERS
 host"; }
type whois >/dev/null 2>&1 || { STOPPERS="$STOPPERS
 whois"; }
type getent >/dev/null 2>&1 || { STOPPERS="$STOPPERS
 getent (comes with glibc)"; }

if [[ "$STOPPERS" != '' ]]; then
  echo >&2 "The following programs are required for this script to run: $STOPPERS"
  exit 1;
fi

# Get the IP address for the domain
domain_name="$1"
ip_address=$(getent hosts "$domain_name" | awk '{ print $1 }')
STATUS=$?
if [ $STATUS -ne 0 ]; then
  exit $STATUS
fi
echo "ip: $ip_address"
if [[ "$ip_address" == '' ]]; then
  echo "Could not find IP address for domain name."
  exit 1
fi


# Get the hostname (PTR) record for the IP addrses
ptr_host=$(host "$ip_address")
STATUS=$?
if [ $STATUS -ne 0 ]; then
  echo "host command failed. No PTR record exist for $ip_address"
fi
echo "host: $ptr_host"
echo -n "Press any key to do an IP whois, or ctrl+c to abort: "
read dramatic_pause


# Do an IP whois lookup
ip_whois_result=$(whois "$ip_address")
STATUS=$?
if [ $STATUS -ne 0 ]; then
  exit $STATUS
fi
echo "$ip_whois_result"
echo -n "Press enter to do an regular whois, or ctrl+c to abort: "
read dramatic_pause


# Do a regular whois lookup
name_whois_result=$(whois "$domain_name")
STATUS=$?
if [ $STATUS -ne 0 ]; then
  exit $STATUS
fi
echo "$name_whois_result"