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Thread: HOWTO: Check you external IP Address from the command line

  1. #1
    Join Date
    Mar 2006
    Location
    Stockholm, Sweden
    Beans
    694
    Distro
    Ubuntu Development Release

    HOWTO: Check you external IP Address from the command line

    I hope you know about the possibility to find out your IP Address by using visiting the site http://www.whatismyip.com . I needed a way to check this from the command line and this is what I came up with:

    For this, you need the packages wget, grep and sed so make sure you have them by checking for them in Synaptic or running the following in a terminal:
    Code:
    sudo apt-get install wget grep sed
    Then, as long as whatismyip.com prints out the IP-Address in the HTML page title, you can use this:

    Create shell script:
    Code:
    cd ~
    mkdir bin
    nano  bin/whatismyip.sh
    Insert this into nano (Copy, then paste into nano by pressing Ctrl + Shift + V):
    Code:
    #!/bin/bash
    
    echo Your external IP Address is:
    wget http://Www.whatismyip.com -O - -o /dev/null | grep '<TITLE>' | sed -r 's/<TITLE>WhatIsMyIP\.com \- //g' | sed -r 's/<\/TITLE>//g'
    
    exit 0
    (You can also use gedit instead of nano, but I chose to use nano above in case this is done through a remote text-based connection)

    Press Ctrl + O, Enter, Ctrl + X, then run:
    Code:
    chmod u+x bin/whatismyip.sh
    Now you can check your external IP Address by running:
    Code:
    ~/bin/whatismyip.sh
    ...in a terminal.

  2. #2
    Join Date
    Aug 2007
    Beans
    69

    Thumbs down Re: HOWTO: Check you external IP Address from the command line

    dude, kick *** little app, got any more little bash scripts like this?
    good work, ive been looking for something like this
    defcon

  3. #3
    Join Date
    Aug 2007
    Beans
    58

    Re: HOWTO: Check you external IP Address from the command line

    Woah. I asked for something like these nearly half a year ago (with another account) and go no response. I guess I should be glad someone finally had an answer.

    Thanks d00d!

  4. #4
    Join Date
    Oct 2007
    Beans
    26

    Re: HOWTO: Check you external IP Address from the command line

    An update on this useful hack: As of this September, if you look at the source of WhatIsMyIP.com, you'll notice it says
    Code:
    Please set your code to scrape your IP from www.whatismyip.com/automation/n09230945.asp 
    Please set your code to hit this page at a REASONABLE pace.
    The full content of the script can now simply be

    Code:
    #!/bin/bash
    
    wget www.whatismyip.com/automation/n09230945.asp -O - -o /dev/null
    
    exit 0
    Or, if you want it to keep wget from logging, and arrange the output so that the IP address isn't squashed up against the prompt:

    Code:
    #!/bin/bash
    
    wget www.whatismyip.com/automation/n09230945.asp -O - -q
    echo
    
    exit 0

  5. #5
    Join Date
    Jun 2006
    Location
    Fairfax, VA
    Beans
    1,491
    Distro
    Ubuntu 6.06

    Re: HOWTO: Check you external IP Address from the command line

    No need to apt-get wget, grep or sed, they are included in the base install.
    The below also work well in Conky.

    You can also use dyndns.org for wan ip address:
    Code:
    wget -q -O - checkip.dyndns.org|sed -e 's/.*Current IP Address: //' -e 's/<.*$//'
    lan ip address:
    Code:
    ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'
    Last edited by tturrisi; October 16th, 2007 at 02:14 PM.

  6. #6
    Join Date
    Aug 2007
    Beans
    4

    Re: HOWTO: Check you external IP Address from the command line

    Thanks everyone, this is very helpful! Both of your contributions make this nice little script for me:


    Code:
    #!/bin/bash
    
    echo "\nExternal IP:  "
    wget www.whatismyip.com/automation/n09230945.asp -O - -q
    echo "\n\n Internal IP: "
    ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'
    echo
    
    exit 0

  7. #7
    Join Date
    May 2005
    Location
    Portland, OR
    Beans
    7

    Re: HOWTO: Check you external IP Address from the command line

    I know this is an old post but I would like to say thanks for the help. I've been trying to figure out how to traceroute. This is much simpler.

    Just in case anyone wants it, I've created the following PERL script I keep in cron to check my IP and compare it to the previous and email me if it has changed.

    Code:
    #!/usr/bin/perl
    $IP_FILE = "/home/c8h10n4o2/scripts/ipemail.result";
    my $newip = `wget www.whatismyip.com/automation/n09230945.asp -O - -q`;
    my $oldip = getoldip();
    my $send_to = "To: me\@me.com\n";
    my $reply_to = "Reply-to: me\@me.com\n"; 
    my $from = "From: me\@me.com\n";
    my $subject = "Subject: IP Address: $newip\n"; 
    my $content = "<h1>$newip</h1>"; 
    if($newip ne $oldip)
    {
       writenewip($newip);
       unless(open (MAIL, "|/usr/sbin/sendmail me\@me.com")) 
       {
          print "error.\n";
          warn "Error starting sendmail: $!";
       }
       else{
          print MAIL $from;
          print MAIL $reply_to;
          print MAIL $subject;
          print MAIL $send_to;
          print MAIL "Content-type: text/html\n\n";
          print MAIL $content;
          close(MAIL) || warn "Error closing mail: $!";
          print "Mail sent\n";
       }
    }
    
    sub writenewip
    {
       my($newip) = @_;
       print ("new IP = $newip\n");
       open IPFILE, ">$IP_FILE";
       print IPFILE "$newip\n";
       close IPFILE;
    }
    
    sub getoldip
    {
       open IPFILE, "$IP_FILE";
       my($line) = 0;
       while ( <IPFILE> )
       {
          chomp;
          $line = $_;
       }
       close IPFILE;
       return($line);
    }

  8. #8
    Join Date
    Oct 2007
    Location
    Rotherham, UK
    Beans
    28
    Distro
    Ubuntu 7.10 Gutsy Gibbon

    Re: HOWTO: Check you external IP Address from the command line

    Nice thanks for this.. Works perfect the shorter code!

  9. #9
    Join Date
    Nov 2007
    Beans
    1

    Re: HOWTO: Check you external IP Address from the command line

    This is a little bash script I made to email me and my friend (in CC, -c option in mail command) about IP changes for DNS record changes. Includes a logger to check if the cronjob is indeed running every day.
    Code:
    #!/bin/bash
    
    IPFILE=/etc/ipaddress
    
    CURRENT_IP=$(wget -q -O - http://www.whatismyip.com/automation/n09230945.asp)
    
    MAIL_FROM="From: noreply@domain.org"
    
    if [ -f $IPFILE ]; then
            KNOWN_IP=$(cat $IPFILE)
    else
            KNOWN_IP=
    fi
    
    if [ "$CURRENT_IP" != "$KNOWN_IP" ]; then
            echo $CURRENT_IP > $IPFILE
    
            MAIL_SUBJECT="IP address for domain.org changed"
            MAIL_BODY="The IP address for domain.org has been changed to $CURRENT_IP. Please change the nameserver records accordingly."
    
            echo $MAIL_BODY | mail -a "$MAIL_FROM" -s "$MAIL_SUBJECT" -c secondmoo@cows.org foobar@domain.org
            logger -t ipcheck -- IP changed to $CURRENT_IP
    else
            logger -t ipcheck -- No IP change
    fi

  10. #10
    Join Date
    Jul 2007
    Beans
    33

    Re: HOWTO: Check you external IP Address from the command line

    I now use:

    Code:
    #!/bin/bash
    wget http://Www.whatismyip.org -O - -o /dev/null
    echo
    exit 0

    Best!
    Last edited by skipx; September 14th, 2008 at 08:58 PM.

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