How do I find out what my external IP address is?

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My computers are sitting behind a router/firewall. How do I programmatically find out what my external IP address is. I can use http://www.whatsmyip.org/ for ad-hoc queries,

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13条回答

我在风中等你

2020-12-13 04:34
```
curl ifconfig.me
```
or
```
curl ifconfig.me/ip
```
Incase you don't have curl installed,
```
wget ifconfig.me/ip 2>/dev/null && cat ip
```
Hope this helps.
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一整个雨季

2020-12-13 04:35
Since this question was asked a while back, there's now a freely available web service designed specifically to allow you to determine your IP address programmatically, called ipify.
```
$ curl 'https://api.ipify.org?format=json'
```
Results in
```
{"ip": "1.2.3.4" /* your public IP */}
```
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伪装坚强ぢ

2020-12-13 04:36

ifcfg.me allows Lookup via

nslookup
telnet
ftp
and http

even works with IPv6

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一个人的身影

2020-12-13 04:41
Simple but not elegant for this use. I created a VBS file with the following code to drop the result to dropbox and google drive ... have to delete the file for new one to sync though for some reason.

This runs on a PC at my home. My PC is set to resume on power outage and a task is scheduled to run this every day once (note if you have it run often, the site will block your requests).

Now I can get my IP address on the road and watch people steal my stuff :-)
```
get_html "http://ipecho.net/plain", "C:\Users\joe\Google Drive\IP.html"

get_html "http://ipecho.net/plain", "C:\Users\joe\Dropbox\IP.html"



sub get_html (up_http, down_http)

dim xmlhttp : set xmlhttp = createobject("msxml2.xmlhttp.3.0")

xmlhttp.open "get", up_http, false

xmlhttp.send

dim fso : set fso = createobject ("scripting.filesystemobject")

dim newfile : set newfile = fso.createtextfile(down_http, true)

newfile.write (xmlhttp.responseText)

newfile.close

set newfile = nothing
set xmlhttp = nothing

end sub
```
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没有蜡笔的小新

2020-12-13 04:42
If you have access to a webserver with modphp, you can roll your own:
```
<?php print $_SERVER['REMOTE_ADDR']; ?>
```
If you don't want that to get abused, you'll have to keep it secret or add request limits.

I've been using one on my server for years.

Explicitly:

Create a file called whatismyip.php in your public_html folder in your website. It can be called anything and be anywhere in your webroot.

Add the line above, and then query your server:
```
curl http://example.com/whatismyip.php
```
for example.
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渐次进展

2020-12-13 04:43
Unfortunately there is no easy way to do it.

I would use a site like www.whatsmyip.org and parse the output.

checkip.dyndns.com returns a very simple HTML file which looks like this:
```
<html>
  <head>
    <title>Current IP Check</title>
  </head>
  <body>
    Current IP Address: 84.151.156.163
  </body>
</html>
```
This should be very easy to parse. Moreover the site is exists for about ten years. There is hope that it will be around for a while.
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