How to Get the Network Interface and Its Right Ipv4 Address

How do I get the network interface and its right IPv4 address?

foreach(NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
{
   if(ni.NetworkInterfaceType == NetworkInterfaceType.Wireless80211 || ni.NetworkInterfaceType == NetworkInterfaceType.Ethernet)
   {
       Console.WriteLine(ni.Name);
       foreach (UnicastIPAddressInformation ip in ni.GetIPProperties().UnicastAddresses)
       {
           if (ip.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
           {
               Console.WriteLine(ip.Address.ToString());
           }
       }
   }  
}

This should get you what you want. ip.Address is an IPAddress, that you want.

Get network interface name from IPv4 address

#include <windows.h>
#include <iphlpapi.h>
#include <stdio.h>

#pragma comment(lib, "iphlpapi.lib")

int
main(int argc, char** argv) {
  PIP_ADAPTER_INFO pAdapterInfo;
  pAdapterInfo = (IP_ADAPTER_INFO *) malloc(sizeof(IP_ADAPTER_INFO));
  ULONG buflen = sizeof(IP_ADAPTER_INFO);

  if(GetAdaptersInfo(pAdapterInfo, &buflen) == ERROR_BUFFER_OVERFLOW) {
    free(pAdapterInfo);
    pAdapterInfo = (IP_ADAPTER_INFO *) malloc(buflen);
  }

  if(GetAdaptersInfo(pAdapterInfo, &buflen) == NO_ERROR) {
    PIP_ADAPTER_INFO pAdapter = pAdapterInfo;
    while (pAdapter) {
      printf("\tAdapter Name: \t%s\n", pAdapter->AdapterName);
      printf("\tAdapter Desc: \t%s\n", pAdapter->Description);
      printf("\tAdapter Addr: \t%ld\n", pAdapter->Address);
      printf("\tIP Address: \t%s\n", pAdapter->IpAddressList.IpAddress.String);
      printf("\tIP Mask: \t%s\n", pAdapter->IpAddressList.IpMask.String);
      printf("\tGateway: \t%s\n", pAdapter->GatewayList.IpAddress.String);
      if(pAdapter->DhcpEnabled) {
        printf("\tDHCP Enabled: Yes\n");
        printf("\t\tDHCP Server: \t%s\n", pAdapter->DhcpServer.IpAddress.String);
        printf("\tLease Obtained: %ld\n", pAdapter->LeaseObtained);
      } else {
        printf("\tDHCP Enabled: No\n");
      }
      if(pAdapter->HaveWins) {
        printf("\tHave Wins: Yes\n");
        printf("\t\tPrimary Wins Server: \t%s\n", pAdapter->PrimaryWinsServer.IpAddress.String);
        printf("\t\tSecondary Wins Server: \t%s\n", pAdapter->SecondaryWinsServer.IpAddress.String);
      } else {
        printf("\tHave Wins: No\n");
      }
      pAdapter = pAdapter->Next;
    }
  } else {
    printf("Call to GetAdaptersInfo failed.\n");
  }
}

As @sonyisda1 mentioned, this is taken from MSDN.

Get local IP address of ethernet interface in C#

The following code gets the IPv4 from the preferred interface. This should also work inside virtual machines.

using System.Net;
using System.Net.Sockets;

public static void getIPv4()
    {
        try
        {
            using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, 0))
            {
                socket.Connect("10.0.1.20", 1337); // doesnt matter what it connects to
                IPEndPoint endPoint = socket.LocalEndPoint as IPEndPoint;
                Console.WriteLine(endPoint.Address.ToString()); //ipv4
            }
        }
        catch (Exception)
        {
            Console.WriteLine("Failed"); // If no connection is found
        }
    }

How can I get the IP address from a NIC (network interface controller) in Python?

Two methods:

Method #1 (use external package)

You need to ask for the IP address that is bound to your eth0 interface. This is available from the netifaces package

import netifaces as ni
ip = ni.ifaddresses('eth0')[ni.AF_INET][0]['addr']
print(ip)  # should print "192.168.100.37"

You can also get a list of all available interfaces via

ni.interfaces()

Method #2 (no external package)

Here's a way to get the IP address without using a python package:

import socket
import fcntl
import struct

def get_ip_address(ifname):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    return socket.inet_ntoa(fcntl.ioctl(
        s.fileno(),
        0x8915,  # SIOCGIFADDR
        struct.pack('256s', ifname[:15])
    )[20:24])

get_ip_address('eth0')  # '192.168.0.110'

Note: detecting the IP address to determine what environment you are using is quite a hack. Almost all frameworks provide a very simple way to set/modify an environment variable to indicate the current environment. Try and take a look at your documentation for this. It should be as simple as doing

if app.config['ENV'] == 'production':
  # send production email
else:
  # send development email

How do I get the Local Network IP address of a computer programmatically?

In How to get IP addresses in .NET with a host name by John Spano, it says to add the System.Net namespace, and use the following code:

//To get the local IP address 
string sHostName = Dns.GetHostName (); 
IPHostEntry ipE = Dns.GetHostByName (sHostName); 
IPAddress [] IpA = ipE.AddressList; 
for (int i = 0; i < IpA.Length; i++) 
{ 
    Console.WriteLine ("IP Address {0}: {1} ", i, IpA[i].ToString ()); 
}

How to add Network Interfaces to a Combobox and resolve ip based on selected interface?

When getting adapter names and IP addresses, I suggest something like the following:

By storing them in a dictionary you can access them by their adapter name.

Please see my comments for detailed explanation on the process I used.

I hope this helps, I tried to be thorough with the comments.

Notes for the method for storing the adapter names and IPs

//create a dictionary storing the name and address of each adapter
public Dictionary<string,IPAddress> ip4ByAdapter = new Dictionary<string,IPAddress>();
public Dictionary<string,IPAddress> ip6ByAdapter = new Dictionary<string,IPAddress>();

void GetIpsAndAdapters()
{
    //Get the network interfaces
    NetworkInterface[] netInterfaces = NetworkInterface.GetAllNetworkInterfaces();

    //don't forget to clear the combo box
    comboBox1.Items.Clear();

    foreach(NetworkInterface adapter in netInterfaces)
    {
        //get the IP Properties for short hand
        IPInterfaceProperties ipProps = adapter.GetIPProperties();

        //set a default value of 0.0.0.0
        IPAddress ipv4 = new IPAddress(0); 

        //if it has one, store the ipv4 of the current adapter
        if(ipProps.UnicastAddresses.Count > 1)
            ipv4 = ipProps.UnicastAddresses[1].Address;

        //set a default value of 0.0.0.0
        IPAddress ipv6 = new IPAddress(0);

        //if it has one, store the ipv6 of the current adapter
        if (ipProps.UnicastAddresses.Count > 0)
            ipv6 = ipProps.UnicastAddresses[0].Address;

        //store the matching pair of adapter and ip address in dictionary
        //check for duplicates (loopbacks perhaps) and ignore them
        if(!ip4ByAdapter.ContainsKey(adapter.Name))
            ip4ByAdapter.Add(adapter.Name, ipv4);

        //same for ipv6
        if(!ip6ByAdapter.ContainsKey(adapter.Name))
            ip6ByAdapter.Add(adapter.Name, ipv6);

        comboBox1.Items.Add(adapter.Name);
    }
}

Notes for the comboBox1.SelectedIndexChanged Event

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    //if we haven't selected an item yet, just do nothing
    if(comboBox1.SelectedIndex == -1 || comboBox1.SelectedItem is null)
        return;

    //reset the textboxes, just to an empty string
    tblocalip.Text = "";
    tblocalip6.Text = "";

    //if the Dictionary contains a matching adapter to the one selected in the combo box
    if(ip4ByAdapter.ContainsKey(comboBox1.SelectedItem.ToString()))
    {
        //then show it
        tblocalip.Text = ip4ByAdapter[comboBox1.SelectedItem.ToString()].ToString();
    }

    //same for ipv6
    if(ip6ByAdapter.ContainsKey(comboBox1.SelectedItem.ToString()))
    {
        tblocalip6.Text = ip6ByAdapter[comboBox1.SelectedItem.ToString()].ToString();
    }
}

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