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I need to find my external IP address from a bash script. At the moment I use this function:

myip () { 
    lwp-request -o text checkip.dyndns.org | awk '{ print $NF }'
}

But it depends on perl-libwww, perl-html-format, perl-html-tree installed. What other ways can I get my external IP?

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4  
What do you mean by the external IP? The two answers so far use HTTP. The response may end up being the IP of your ISP's proxy server. (Which may be what you want.) –  billpg Oct 14 '11 at 17:21
    
@billpg: I mean the IP of the NAT router –  eugene y Oct 14 '11 at 20:09
    
Then you'll need a what-is-my-IP web service that uses HTTPS. Alas, I don't know of any. –  billpg Oct 14 '11 at 22:22
    
@billpg ipcheckit.com –  Gilles Oct 14 '11 at 22:48

12 Answers 12

up vote 31 down vote accepted

Since whatsmyip.org and ifconfig.me have already been mentioned:

curl -s icanhazip.com
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3  
Another one: ip.appspot.com or ip.appspot.com –  Lekensteyn Nov 9 '11 at 8:31
1  
These two support IPv6. –  Josh Lee Oct 8 '12 at 17:31
curl -s http://whatismyip.org/

Update: whatismyip.com removed the free service to check the IP address and this no longer works.

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3  
+1 I knew about whatismyip.com, but not whatismyip.org, that's awesome. –  Julian Oct 14 '11 at 15:15
    
Never knew about that one! Great site! –  IDWMaster Oct 14 '11 at 22:48
2  
@MaciekSawicki Is the -s option really necessary in this case? I tried with/without it in my fedora 15 - bash 4.2.10(1) and it worked in both ways. –  ztank1013 Oct 15 '11 at 14:05
3  
Doesn't seem to work anymore via CLI, but going to the webpage from a web browser works. I'm using openSUSE 12.1 x64. –  SaultDon Aug 16 '12 at 16:13
4  
whatismyip.com has removed the free service to check external IP. So, I'm afraid this is no longer correct. icanhazip.com still works. –  daSong Jan 17 '13 at 10:20

I'd recommend getting it directly from a DNS server.

Most of the answers here all go over HTTP to a remote server. Some of them require parsing of the output, or rely on the User-Agent header to make the server respond in plain text. They also change quite frequently (go down, change their name, put up ads, might change output format etc.).

  1. The DNS response protocol is standardised (the format will stay compatible).
  2. Historically DNS services (OpenDNS, Google Public DNS, ..) tend survive much longer and are more stable, scalable and generally looked after than whatever new hip whatismyip.com HTTP service is hot today.
  3. (for those geeks that care about micro-optimisation), this method should be inherently faster (be it only by a few micro seconds).

Using dig with OpenDNS as resolver:

dig +short myip.opendns.com @resolver1.opendns.com

Perhaps alias it in your bashrc so it's easy to remember

alias wanip='dig +short myip.opendns.com @resolver1.opendns.com'

Responds with a plain ip address:

$ wanip
80.100.192.168
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1  
you are right it's too fast.. –  Rahul Patil Jul 9 '13 at 16:24
    
Why hasn't this been accepted? –  bitmask Apr 8 at 15:35
wget -O - -q http://whatismyip.org/
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1  
I was not able to get my IP like this, just gives it as:<img src='ipimg.php'/> –  Yuugian Apr 4 '13 at 13:38

You can use ifconfig.me as alternative to whatismyip.org.

curl -s http://ifconfig.me

Also ifconfig.me has some additional functional. To find out what else information you can receive visit the website.

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netcat icanhazip.com 80 <<< $'GET / HTTP/1.1\nHost: icanhazip.com\n\n' | tail -n1
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Blank output here, although the site works. Any idea why? I am behind a proxy, if that's relevant, but wget icanhazip.com works. –  l0b0 Apr 4 '13 at 11:23
    
@l0b0 Try to omit the | tail -n1 part and see what you get from the proxy –  eugene y Apr 4 '13 at 13:18
    
Nothing, just exit code 1. Ditto for netcat icanhazip.com 80. Looks like it ignores $http_proxy and friends, because specifying the proxy and port with -x just resulted in a hanging process. –  l0b0 Apr 4 '13 at 14:05
    
@l0b0: netcat proxy 3128 <<<$'GET http://icanhazip.com/ HTTP/1.0\n\n' | tail -n 1 for a basic HTTP proxy (assuming it's running on port 3128). You will obviously get the IP address of the proxy back, though. –  tripleee Jul 4 '13 at 4:07
1  
HTTP 1.0 does not have the Host: request header - name-based virtual hosting was one of the major improvements in HTTP 1.1. Either change the request to specify HTTP/1.1, or remove the Host header (I recommend the former). –  Michael Kjörling Jul 4 '13 at 7:39

I prefer to use curlmyip.com It's as simple as:

curl curlmyip.com

It's short and simple to remember.

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For use in bash —the intent of the OP—, you cannot do without the -s option mentioned in other answers. –  Serge Stroobandt Jul 20 at 11:53
    
@SergeStroobandt Yes you can. All the -s switch does is run it in silent mode, ie. error messages won't be displayed. So it comes down to how he wants his script to handle errors. The command itself will return an IP address as reliably as using the -s. –  Garrett Fogerlie 17 hours ago

If you want to use HTTPS to avoid some potential pitfalls:

_result=$(wget -qO- https://ipcheckit.com/)
_result="${_result##*Your IP address is<br><b>}"
printf '%s\n' "${_result%%</b></p>*}"
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1  
Perhaps you could elaborate on what the potential pitfalls are that you are avoiding here? –  Caleb Oct 17 '12 at 6:27
    
The domain ipcheckit.com apparently is for sale and not hosts the IP address displaying service anymore. –  manatwork Jan 17 '13 at 11:59
    
ah, the pitfalls of writeonly scripts :) –  Ярослав Рахматуллин Jul 4 '13 at 14:07
    
@Caleb: Proxy avoidance, although apparently this doesn't work any more, so. –  Chris Down Nov 25 '13 at 19:31
    
@Chris Down the technique is still valid, you just need another SSL capable site to use it with. –  Caleb Nov 25 '13 at 21:09

Here is another alternative that depends on hosts who's business resolves around managing dynamic IP rather that "public service" sites that may go away or change format.

  1. Register your server at one of the many free dynamic dns services (e.g. no-ip.com) This will give you a DNS entry like xxx.no-ip.org.
  2. Install the service's dynamic update tool (reports IP changes to service).

To get the IP address in a script, just do:

external_ip=`dig +short xxx.no-ip.org`

Great for use in cron job to check if dynamic IP has changed and some configuration entries need to be changed.

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curl ident.me

OR

curl ifconfig.me

OR

curl tnx.nl/ip

OR

curl ipecho.net/plain

OR

curl ip.appspot.com

OR

curl whatsmyip.akamai.com

Reference

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Use curl to hit shtuff.it's ip service

curl -s http://shtuff.it/myip/short
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This always works for me, I use it in my conky to get my IP address.

wget -q -O - checkip.dyndns.org | sed -e 's/[^[:digit:]\|.]//g'
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