What's my IP Address?

Question

I'm surprised this hasn't come up in a challenge yet.

Output the IP address of the machine you're running on. You are required to output both the local and external IP addresses.

Local IP address, ie along the default format of 192.168.x.x

Public IP address can be verified by using google https://www.google.co.uk/search?source=hp&q=whats+my+ip

Output can be in any format. IPv4 or IPv6 or any mix of each is allowed, however they must be the only output. Code can be a full program or a function.

code-golf rules apply so shortest code wins.

Standard Loopholes are forbidden.

EDIT: As per @Peter Taylor's comment, in the case where multiple of either type of address are present, you can choose to either output the first one, or as many as you can access. So long as at least one local and one public are present.

Answer 1

Bash + curl + iproute2, 54 50 49 48 33 bytes

ip r g 1|awk '$0=$7'
curl eth0.me

Thanks @DomHastings for golfing off 1 byte!

Thanks @Sisyphus for coming up with a shorter URL!

Thanks @zeppelin for golfing off 9 bytes!

Answer 2

Bash 37 31 27 bytes

This is inspired by the answer by Bruce Forte. That answer only works with IPv4 which means it doesn't work for me. I have rewritten it into a version that (only) works with IPv6:

ip r g b::|awk '$0=$9" "$9'

This is tested on Ubuntu 14.04.5 connected through PPPoE and since IPv6 is designed to be used without any NAT it will output the same IP address twice.

-6 bytes thanks to zeppelin, -2 bytes thanks to Ferrybig, -2 bytes thanks to Markasoftware.

Answer 3

AutoIt, 56 53 bytes

#include<Inet.au3>
ConsoleWrite(@IPAddress1&_GetIP())

@IPAddress1 is a macro that returns

IP address of first network adapter

_GetIP() returns

the public IP address.

---

-3 bytes thanks to @mınxomaτ

Answer 4

Mathematica, 17 bytes

^{Mathematica has a builtin for everything}

$MachineAddresses

As described in the documentation, this builtin command lists all IP addresses (both local and external) associated with your device.

Answer 5

C#, 196 194 188 163 bytes

namespace System.Net.Sockets{using Linq;_=>Dns.GetHostEntry("").AddressList.First(i=>(int)i.AddressFamily==2)+" "+new WebClient().DownloadString("http://eth0.me")}

Saved 2 bytes thanks to @Xynos.
Saved 25 bytes thanks to @Nick.

Full/Formatted Version:

namespace System.Net.Sockets
{
    using Linq;

    class P
    {
        static void Main()
        {
            Func<object, string> f = _ =>
                Dns.GetHostEntry(Dns.GetHostName())
                    .AddressList
                    .First(i => (int)i.AddressFamily == 2) + " " + new WebClient().DownloadString("http://eth0.me");

            Console.WriteLine(f(null));

            Console.ReadLine();
        }
    }
}

Answer 6

PowerShell v4+, 40 36 bytes

NetIPAddress|% IPA*
iwr eth0.me|% C*

(Only works on Server 2012 R2 or above, or Windows 8.1 or above. Doesn't work on TIO.)

Does exactly what it says on the tin. Gets the local network IP addresses and selects just the IPAddress portion thereof (e.g., filters out the subnet mask, the gateway, etc.).

The second is a Invoke-WebRequest to http://eth0.me which simply gets the Content thereof; i.e., just the public IP address.

---

Ungolfed version:

(Get-NetIPAddress).IPAddress
(Invoke-WebRequest eth0.me).content

Answer 7

#Unix Shell + stunclient, 40 bytes

stunclient stun.vo.lu|cut -d: -f2|sed 1d

Makes use of a STUN protocol:

Session Traversal Utilities for NAT (STUN) is a protocol that serves as a tool for other protocols in dealing with Network Address Translator (NAT) traversal. It can be used by an endpoint to determine the IP address and port allocated to it by a NAT

The STUN server name is from the Public STUN server list.

The output format is:

 LOCAL IPV4 ADDRESS
 PUBLIC IPV4 ADDRESS

Note that both lines will be indented with a single space, but I believe this does not break the output rules as written.

Sample output:

  192.168.1.100    
  209.85.233.147

Answer 8

curl (bash one-liner): 27 bytes

curl -w%{local_ip} eth0.me

The result is printed on stdout and looks like this:

1.2.3.4
192.168.0.10
# no trailing newline, use "curl -w%{local_ip}\\n eth0.me" for it

curl should be at least of version 7.29.0 (from Feb 6, 2013).

The answer is based on https://codegolf.stackexchange.com/a/139538/66016.

Answer 9

Go, MacOS only, 10 bytes

In macOS this killswitch could be used, it can print current private active IP and public IP:

$ killswitch 
Interface  MAC address         IP
en1        bc:34:36:d2:81:ba   192.168.2.10

Public IP address: 179.43.176.99

No VPN interface found, verify VPN is connected

This is not a built-in tool but tries to simplify the process of finding the proper IP's.

The output could get by using commands like:

$ route get 0.0.0.0

$ ifconfig | pcregrep -M -o '^[^\t:]+:([^\n]|\n\t)*status: active'

$ networksetup -listnetworkserviceorder

$ scutil --dns

Public IP:

$ dig o-o.myaddr.l.google.com @ns.google.com txt +short

Answer 10

Python 3, 124 133 bytes

from urllib2 import urlopen
import socket
a=urlopen('http://eth0.me').read()
b=socket.gethostbyname(socket.gethostname())
print a,b

Answer 11

PowerShell v3+ (alternative answer for windows 7+)

((ipconfig) -match "v4").split(":")[1]
Invoke-RestMethod eth0.me

Answer 12

Bash + Awk + Curl, 43 bytes

using only built in tools for Mac and Linux

ifconfig|awk '/bro/{print $2}';curl eth0.me

Answer 13

Node.js (JavaScript) 224 223 194 175 173 130 bytes

r=require,l=console.log,r('dns').lookup(r('os').hostname(),(a,b)=>l(b));r('http').get('http://eth0.me',a=>a.on('data',c=>l(c+"")))

Ungolfed version:

require('dns').lookup(require('os').hostname(), (err, loc, fam) => console.log(loc));
require('http').get('http://eth0.me', res => {
    res.on('data', chunk => console.log(chunk + ""));
});

---

• Saved 1 byte (due to unnecessary semicolon).
• Saved 29 bytes thanks to @AndrewLi (used arrow functions for shorter code).
• Saved 19 bytes thanks to @MiniGod (used .get() instead of .request() - .end(); removed).
• Saved 2 bytes thanks to @Zacharý (parentheses not needed around a lone parameter of an arrow function).
• Saved 43 bytes thanks to @Birjolaxew (stored require and console.log in single-letter variables, passed url directly to require('http').get, logged output directly from data event).

Answer 14

Python 2.7.13 128 bytes

print __import__("urllib").urlopen("http://eth0.me").read(),__import__("socket").gethostbyname(__import__("socket").getfqdn())

Answer 15

Windows' Batch File, 116 bytes

@for /f "tokens=1-2 delims=:" %%a in ('ipconfig^|find "v4"')do @echo%%b
@powershell -Command "(iwr eth0.me).content"

The first line iterates through the results of running ipconfig and gets your local IPv4 address.

For the public IP part, I had to steal a bit from the marvelous Powershell answer because, as far as I know, there is no way to get the machine's public IP using solely batch scripting.

We start with an @ sign, to suppress echoing the prompt (C:\...\path>), then run the Powershell command Invoke-WebRequest (with its alias, iwr) and extract the content part of that.

I experimented with not using (...).content and, instead, only running the command and extracting the actual information from the complete output, using batch. But that proved to be way longer than this solution, so I kept it.

Tested on Windows 10.0.15063.

Answer 16

R, 142, 140, 137 bytes

library(magrittr);system("ipconfig",int=T)%>%regmatches(.,regexpr("v4.+",.))%>%{a=nchar(.);substr(.,a-14,a)};readLines("http://eth0.me")

Tested on win10 and R (3.4.1).
Thanks for @Bruce-Forte for short URL.

Ungolfed version:

library(magrittr)
system("ipconfig",int=T) %>% 
     regmatches(.,regexpr("v4.+",.)) %>% 
      {a <- nchar(.)
       substr(., a - 14, a)}
readLines("http://eth0.me")

Answer 17

Bash + Curl, 24 bytes

hostname -i;curl eth0.me

Answer 18

MS-SQL, 59 bytes

SELECT TOP 1 local_net_address
FROM sys.dm_exec_connections

Returns the client-facing IP address of the SQL instance executing the query.

Answer 19

VBA, 58 Bytes

Whoops, does not handle local address - fix in progress

Note: Uses reference to

Microsoft Internet Controls

Anonymous VBE immediate window function that takes no input and outputs the user's IP address via an Internet Explorer window

Set i=New InternetExplorer:i.Visible=1:i.Navigate"eth0.me"

Answer 20

Bash — 29 bytes (linux)

curl ipinfo.io/ip
hostname -i

Answer 21

Python 3, 97 bytes

from socket import*
from requests import*
gethostbyname(gethostname()),get('http://eth0.me').text

returns tuple with ('LOCAL_IP', 'PUBLIC_IP'), as apparently

x = 2,3
type(x)
>>> tuple

Python 3, 103 bytes

from socket import*
from requests import*
gethostbyname(gethostname()),get('http://api.ipify.org').text

ditto, read below.

---

Python 3, 107 bytes

First solution

from socket import*
from requests import*
gethostbyname(gethostname())+" "+get('http://api.ipify.org').text

The +" "+ part is for joining strings together.

If you leave just the + sign, 103 bytes are possible, but would yield the strings without spaces which could lead to results like this "5.5.5.111222.222.222.222" and they should still be readable, as there are only 3 digits at max in every ip part.

But there are edge cases like "5.5.5.11111.222.222.222" where it would be impossible to distinguish the local vs public part.

Other possible savings are in the public ip grabber tool. I used this site, as it was the first thing I found on the Internet and it returns html with just text in it, which is super nice. I saw other people using http://eth0.me, but it doesn't load for me on my machine and my antivirus has it blacklisted, thus Python raises a ConnectionError. It loads through Tor though, so I don't know whether I should use it.

Python 3, 101 bytes

from socket import*
from requests import*
gethostbyname(gethostname())+" "+get('http://eth0.me').text