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If I check with google, I can see my public IP. Is there something on the Ubuntu command-line which will yield me the same answer?

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2  
"having dynamic IP", "SSH using some other system across the internet", "the command which will display the present PUBLIC IP". You see the chicken/egg problem here? How would you be able to run commands on a remote server without knowing its address? You might be more interested in services like no-ip.com / DynDNS.org. – gertvdijk Jan 9 '13 at 13:11
    
one cannot SSH without knowing the public IP my friend... dynDNS costs a lot and no-ip tough works but the situation don't allow that... anyway the question has been already answered.. thanks for your suggestion – Z9iT Jan 10 '13 at 8:46
    
PS duckduckgo.com/?q=ip (no command line, but no big brother G neither) – Campa Jan 28 '15 at 7:28

20 Answers 20

up vote 243 down vote accepted

If you are behind a router, then your computer will not know about the public IP address as the router does a network address translation.

If you are not behind a router, you can find it out using ifconfig. Else you could request this website using curl or wget and extract the information you need from it, e.g. using a perl script.

curl -s checkip.dyndns.org | sed -e 's/.*Current IP Address: //' -e 's/<.*$//'  

or shorter

wget http://ipinfo.io/ip -qO -

should do the trick.

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23  
ty - right after I posted, I realized that I didn't google for an answer first: looks like this will work curl -s checkip.dyndns.org|sed -e 's/.*Current IP Address: //' -e 's/<.*$//' Other possibilities are listed here: go2linux.org/what-is-my-public-ip-address-with-linux – kfmfe04 Jan 16 '12 at 12:01
1  
sure - you can add it to your answer – kfmfe04 Jan 16 '12 at 13:18
21  
This doesn't work anymore. whatsmyip.org is displaying the IP in an image (<img src='ipimg.php'/>). – fiatjaf Oct 27 '13 at 6:17
2  
Exacly as Giovanni P stated. The OP should change the accepted anwser. – loostro Apr 11 '14 at 21:45
4  
curl -s ipinfo.io/ip – chao Oct 7 '15 at 20:38

For finding the external ip, you can either use external web-based services, or use system based methods. The easier one is to use the external service, also the ifconfig based solutions will work in your system only if you're not behind a NAT. the two methods has been discussed below in detail.

Finding external IP using external services

The easiest way is to use an external service via a commandline browser or download tool. Since wget is available by default in Ubuntu, we can use that.
To find your ip, use-

$ wget -qO- http://ipecho.net/plain ; echo

Courtesy:

You could also use lynx(browser) or curl in place of wget with minor variations to the above command, to find your external ip.

Using curl to find the ip:

$ curl ipecho.net/plain

For a better formatted output use:

$ curl ipecho.net/plain ; echo

A faster (arguably the fastest) method using dig with OpenDNS as resolver:

The other 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 to 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

111.222.333.444

Copied from: http://unix.stackexchange.com/a/81699/14497

Finding external IP without relying on external services

  • If you know your network interface name

Type the following in your terminal:

$ LANG=c ifconfig <interface_name> | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'

In the above, replace <interface_name> with the name of your actual interface, e.g: eth0, eth1, pp0, etc...

Example Usage:

$ LANG=c ifconfig ppp0 | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'
111.222.333.444
  • If you don't know your network interface name

Type the following in your terminal (this gets the name and ip address of every network interface in your system):

$ LANG=c ifconfig | grep -B1 "inet addr" |awk '{ if ( $1 == "inet" ) { print $2 } else if ( $2 == "Link" ) { printf "%s:" ,$1 } }' |awk -F: '{ print $1 ": " $3 }'

Example Usage:

$ LANG=c ifconfig | grep -B1 "inet addr" |awk '{ if ( $1 == "inet" ) { print $2 } else if ( $2 == "Link" ) { printf "%s:" ,$1 } }' |awk -F: '{ print $1 ": " $3 }'
lo: 127.0.0.1
ppp0: 111.222.333.444

N.B: Outputs are indicative and not real.

Courtesy: http://www.if-not-true-then-false.com/2010/linux-get-ip-address/

UPDATE

  1. LANG=c has been added to ifconfig based usages, so that it always gives the english output, irrespective of locale setting.
share|improve this answer
1  
@Z9iT, Sure.. It should work in any linux distribution provided that you have wget installed. As said if you have either curl or lynx already available please use that instead. You would need root permission to install so use sudo apt-get install wget – saji89 Jun 1 '12 at 12:19
6  
The commands with ifconfig do only work, if you are not behind a NAT. – lukassteiner Jan 23 '13 at 15:52
1  
just use -w curl option instead of echo :) curl -w '\n' ident.me – drAlberT Jun 11 '14 at 8:17
3  
This proposal using dig is pretty nice unix.stackexchange.com/questions/22615/… – binaryanomaly Mar 14 '15 at 15:31
    
@binaryanomaly, thanks for that. I'll add it to the answer. – saji89 Mar 16 '15 at 5:55

My favorite has always been :

curl ifconfig.me

simple, easy to type.

You will have to install curl first ;)

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3  
@Z9iT, I just checked this now. Yes, it would output the external ip in your terminal. – saji89 Jun 1 '12 at 13:13
3  
The response time from ifconfig.me seems quite a bit slower than ipecho.net. – Drew Noakes Oct 25 '13 at 14:57
1  
If you don't have curl but have wget: wget -U curl -qO- ifconfig.me – sch Aug 14 '14 at 20:16
1  
ifconfig.me does not seem to be responding :( – Asfand Yar Qazi Jan 20 at 11:51
1  
@AsfandYarQazi - working here. You can try one of the alternates , icanhazip.com – bodhi.zazen Jan 20 at 12:48

icanhazip.com is my favorite.

curl icanhazip.com

You can request IPv4 explicitly:

curl ipv4.icanhazip.com

If you don't have curl you can use wget instead:

wget -qO- icanhazip.com
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2  
try ipv4.icanhazip.com – yprez Jan 10 '13 at 11:15
3  
IPv4: curl ipv4.icanhazip.com IPv6: curl ipv6.icanhazip.com – Peter Feb 21 '14 at 10:43
2  
Busybox doesn't have curl, use this instead: wget -qO- http://icanhazip.com – Hengjie Feb 23 '14 at 8:59
1  
here's a bash-only command: exec 3<>/dev/tcp/icanhazip.com/80 && echo -e 'GET / HTTP/1.0\n' >&3 && cat <&3 – J.F. Sebastian Sep 8 '14 at 16:34
1  
ipv6.icanhazip.com seems to not work anymore. – Hibou57 Jan 18 at 16:00

I've found everything to be annoying and slow, so I wrote my own. It's simple and fast.

Its API is on http://api.ident.me/

Examples:

curl ident.me
curl v4.ident.me
curl v6.ident.me
share|improve this answer
1  
Woah, that was really fast! – waldyrious Dec 7 '13 at 4:19
1  
I find the icanhazip.com solution faster and it includes a newline in the output. – Tyler Collier Aug 19 '14 at 0:00
    
Yes, it was indeed faster lately. Just tweaked my solution. – Pierre Carrier Sep 9 '14 at 13:53
1  
Kudos! 2 years and you are still maintaining it. Well done. "IDENTify ME", is what comes to my mind, when I need ip check :) – Mohnish Sep 28 '15 at 1:37

You could use a DNS request instead of HTTP request to find out your public IP:

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

It uses resolver1.opendns.com dns server to resolve the magical myip.opendns.com hostname to your ip address.

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2  
This is really fast. I did one warmup execution, then 10 executions each of this and curl icanhazip.com. Average for the curl version: 174ms. Average for the DNS-only version: 9ms. ~19x faster. See also: unix.stackexchange.com/a/81699/8383 – Adam Monsen Mar 10 '15 at 21:06
    
@AdamMonsen Thank you for the link. The point of using DNS (as the answer that you've linked says) is that the response is standard (and unlikely to change) and the service (OpenDNS) might stick around longer than most of its http alternatives. The time it takes to make the request might be shadowed by the command start up time. – J.F. Sebastian Mar 11 '15 at 0:40
    
Yep. I wouldn't be surprised if curl itself is slower than dig. Even if they were rewritten to be as similar as possible, curl would still be slower; it uses HTTP (including DNS) and dig only uses DNS. – Adam Monsen Mar 11 '15 at 4:16

The one i'm using is :

wget -O - -q icanhazip.com

Yes, you can have ip :-)

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2  
I prefer curl icanhazip.com sometimes wget is the only one available, but sometimes no wget is available as well and curl is your only option (like OS/X). Either way curl icanhazip.com is almost as easy as curl ifconfig.me but much funnier ;-) – TryTryAgain Aug 25 '12 at 20:38

Type in this exactly, press Enter where indicated:

telnet ipecho.net 80Enter
GET /plain HTTP/1.1Enter
HOST: ipecho.net Enter
BROWSER: web-kitEnter
Enter

This manually submits a HTTP request, which will return your IP at the bottom of a HTTP/1.1 200 OK reply

Example output:

$ telnet ipecho.net 80
Trying 146.255.36.1...
Connected to ipecho.net.
Escape character is '^]'.
GET /plain HTTP/1.1
HOST: ipecho.net
BROWSER: web-kit

HTTP/1.1 200 OK
Date: Tue, 02 Jul 2013 07:11:42 GMT
Server: Apache
Expires: Mon, 26 Jul 1997 05:00:00 GMT
Cache-Control: no-cache
Pragma: no-cache
Vary: Accept-Encoding
Transfer-Encoding: chunked
Content-Type: text/html

f
111.222.333.444
0
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1  
Nice, this worked well, not having to install curl was an advantage for me: one liner: printf "GET /plain HTTP/1.1\nHOST: ipecho.net\nBROWSER: web-kit\n\n" | nc ipecho.net 80 – Ozone Mar 19 '14 at 5:32

Another fast one (might well be the fastest, relatively)

curl ipecho.net/plain
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I have a stupid service for this by telnet. Something like this:

telnet myip.gelma.net

Your IPv4: xxx.xxx.xxx.xxx
Your IPv6: ::ffff:xxxx:xxxx

Feel free to use it.

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For this, STUN was invented. As a client you can send a request to a publicly available STUN server and have it give back the IP address it sees. Sort of the low level whatismyip.com as it uses no HTTP and no smartly crafted DNS servers but the blazingly fast STUN protocol.

Using stunclient

If you have stunclient installed (apt-get install stuntman-client on debian/ubuntu) you can simply do:

$stunclient stun.services.mozilla.com
Binding test: success
Local address: A.B.C.D:42541
Mapped address: W.X.Y.Z:42541

where A.B.C.D is the IP address of your machine on the local net and W.X.Y.Z is the IP address servers like websites see from the outside (and the one you are looking for). Using sed you can reduce the output above to only an IP address:

stunclient stun.services.mozilla.com |
    sed -n -e "s/^Mapped address: \(.*\):.*$/\1/p"

However, your question was how to find it using the command line, which might exclude using a STUN client. So I wonder...

Using bash

A STUN request can be handcrafted, sent to an external STUN server using netcat and be post-processed using dd, hexdump and sed like so:

$echo -en '\x00\x01\x00\x08\xc0\x0c\xee\x42\x7c\x20\x25\xa3\x3f\x0f\xa1\x7f\xfd\x7f\x00\x00\x00\x03\x00\x04\x00\x00\x00\x00' |
    nc -u -w 2 stun.services.mozilla.com 3478 |
    dd bs=1 count=4 skip=28 2>/dev/null |
    hexdump -e '1/1 "%u."' |
    sed 's/\.$/\n/'

The echo defines a binary STUN request (0x0001 indicates Binding Request) having length 8 (0x0008) with cookie 0xc00cee and some pasted stuff from wireshark. Only the four bytes representing the external IP are taken from the answer, cleaned and printed.

Working, but not recommended for production use :-)

P.S. Many STUN servers are available as it is a core technology for SIP and WebRTC. Using one from Mozilla should be safe privacy-wise but you could also use another: STUN server list

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You can read a web page using only bash, without curl, wget:

$ exec 3<> /dev/tcp/icanhazip.com/80 && # open connection
  echo 'GET /' >&3 &&                   # send http 0.9 request
  read -u 3 && echo $REPLY &&           # read response
  exec 3>&-                             # close fd
share|improve this answer
    
That's cool! Very hacker-ish way. :) – Tomofumi Jan 30 '15 at 8:28

Use cURL with ipogre.com (IPv4 and IPv6 are supported).

IPv4

curl ipv4.ipogre.com

IPv6

curl ipv6.ipogre.com

http://www.ipogre.com/faqs/linux.php

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For those of us with login access to our routers, using a script to ask the router what its' WAN IP address is is the most efficient way to determine the external IP address. For instance the following python script prints out the external IP for my Medialink MWN-WAPR300N router:

import urllib, urllib2, cookielib
import re
from subprocess import check_output as co

cookie_jar = cookielib.CookieJar()
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookie_jar))
urllib2.install_opener(opener)

def get(url, values=None):
  data = None
  if values: data = urllib.urlencode(values)
  req = urllib2.Request(url, data)
  rsp = urllib2.urlopen(req)
  return rsp.read()

router = co(['ip', '-o', 'ro', 'list', '0.0.0.0/0']).split()[2]
url = "http://" + router

get(url+"/index.asp")
get(url+"/LoginCheck", dict(checkEn='0', Username='admin', Password='admin'))
page = get(url+"/system_status.asp")

for line in page.split("\n"):
  if line.startswith("wanIP = "):
    print line.split('"')[1]
    exit(1)

Note that this is not very secure (as is the case with plaintext credentials & logging in to most routers), and is certainly not portable (needs to be changed for each router). It is however very fast and a perfectly reasonable solution on a physically secure home network.

To customize the script for another router, I recommend using the tamperdata addon in firefox to determine what HTTP requests to make.

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1  
You should try getting the IP address of the router grammatically. For example router = subprocess.check_output(['ip', '-o', 'ro', 'list', '0.0.0.0/0']).split()[2]. – Cristian Ciupitu Jun 2 '14 at 2:26

These will get the local IPs:

ifconfig

or for shorter output:

ifconfig | grep inet

also

ip addr show

and probably:

hostname -I

This should get the external IP

wget http://smart-ip.net/myip -O - -q ; echo

N.B. If you don't mind to installing curl, this as well:

curl http://smart-ip.net/myip
share|improve this answer
    
ifconfig | sed -nre '/^[^ ]+/{N;s/^([^ ]+).*addr: *([^ ]+).*/\1,\2/p}' will print the local interfaces and corresponding V4 IP's – Hannu Jun 27 '14 at 18:09
    
ifconfig | sed -nre '/^[^ ]+/{N;N;s/^([^ ]+).*addr: *([^ ]+).*addr: *([^ ]+).*/\1,\2,\3/p}' - v4 and v6 IPs. – Hannu Jun 27 '14 at 18:15

I like:

curl http://checkip.amazonaws.com

because:

  • it returns just the plaintext IP, nothing else
  • it is from a well known provider which is unlikely to go offline anytime soon
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If you have installed lynx in Ubuntu type

lynx bot.whatismyipaddress.com
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curl bot.whatismyipaddress.com works too. – Tomofumi Jan 30 '15 at 8:26

Simply issue a traceroute for any website or service..

sudo traceroute -I google.com

Line 2 always seems to be my public IP address after it gets past my router gateway.

user@user-PC ~ $ sudo traceroute -I google.com
traceroute to google.com (173.194.46.104), 30 hops max, 60 byte packets
 1  25.0.8.1 (25.0.8.1)  230.739 ms  231.416 ms  237.819 ms
 2  199.21.149.1 (199.21.149.1)  249.136 ms  250.754 ms  253.994 ms**

So, make a bash command.

sudo traceroute -I google.com | awk -F '[ ]' '{ if ( $2 ="2" ) { print $5 } }'

And the output...

(199.21.149.1)

I don't think relying on PHP scripts and the sort is good practice.

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this is interesting, though really slow and doesn't get my external ip like this – rubo77 Oct 5 '15 at 2:46

A command with no dependencies except 8.8.8.8 being a GOogle DNS:

echo $(ip route get 8.8.8.8 | awk '{print $NF; exit}')
share|improve this answer
    
This only tells you the IP-address of your local outgoing interface. – guntbert Sep 17 '15 at 16:15
    
the command does show the public ip address if I run it on a cloud server. wasn;t that the question? – Rolf Sep 17 '15 at 20:48
    
No, where do you see "cloud server"? – guntbert Sep 17 '15 at 20:52

Just go to whatismyip.com, and it will tell you.

You can refer this question if you want to know how to browse the internet on the terminal.

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Please read the question. He wants to ask how to find ip in terminal command line. – Muhammad bin Yusrat Nov 7 '15 at 6:35

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