LinuxQuestions.org - Script to find the IP from hostname

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Script to find the IP from hostname

Hi everyone,

I know that if we give "ping hostname" will give the IP address.
This is good if I have 5 to 6 hosts.If I have hundreds of hosts ping cmd is very painful to do.

So I need script to find all those IP address......Can anyone help me out with this.

Thanks and advance

HI,

do you have maybe a file with a list of hostnames ?

It would be quickly done like this:

Code:

# vim hostnames_file.txt

google.com

linuxquestions.org

yahoo.com

microsoft.com

then you will "loop" through that file with a script

Code:

vim test-hostnames.sh

#!/bin/bash

while read line; do

#    echo "$line"

  ping -c 1 "$line"

done < "$1"

and you will run it as:

Code:

# ./test-hostnames.sh hostnames_file.txt

ING google.com (209.85.148.113) 56(84) bytes of data.

64 bytes from fra07s07-in-f113.1e100.net (209.85.148.113): icmp_seq=1 ttl=54 time=30.1 ms



--- google.com ping statistics ---

1 packets transmitted, 1 received, 0% packet loss, time 0ms

rtt min/avg/max/mdev = 30.184/30.184/30.184/0.000 ms

PING linuxquestions.org (75.126.162.205) 56(84) bytes of data.

64 bytes from www.linuxquestions.org (75.126.162.205): icmp_seq=1 ttl=46 time=162 ms



--- linuxquestions.org ping statistics ---

1 packets transmitted, 1 received, 0% packet loss, time 0ms

rtt min/avg/max/mdev = 162.975/162.975/162.975/0.000 ms

PING yahoo.com (209.191.122.70) 56(84) bytes of data.

64 bytes from ir1.fp.vip.mud.yahoo.com (209.191.122.70): icmp_seq=1 ttl=45 time=153 ms



--- yahoo.com ping statistics ---

1 packets transmitted, 1 received, 0% packet loss, time 0ms

rtt min/avg/max/mdev = 153.648/153.648/153.648/0.000 ms

PING microsoft.com (64.4.11.37) 56(84) bytes of data.





--- microsoft.com ping statistics ---

1 packets transmitted, 0 received, 100% packet loss, time 0ms

good luck

another way of doing this is as the following:

Code:

# while read domain; do host -t A $domain; done < /tmp/hostnames

google.com has address 74.125.225.33

google.com has address 74.125.225.40

google.com has address 74.125.225.41

google.com has address 74.125.225.38

google.com has address 74.125.225.35

google.com has address 74.125.225.36

google.com has address 74.125.225.32

google.com has address 74.125.225.37

google.com has address 74.125.225.39

google.com has address 74.125.225.46

google.com has address 74.125.225.34

linuxquestions.org has address 75.126.162.205

yahoo.com has address 209.191.122.70

yahoo.com has address 72.30.38.140

yahoo.com has address 98.139.183.24

microsoft.com has address 64.4.11.37

microsoft.com has address 65.55.58.201

Ping may or may not resolve a hostname. It may not be possible to query a secure system to access it's hostname.

^^^ totally agree,
nslookup or dig might be better.