How to get ipv4 type IP Adderss & Primary IP

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hi everyone

I am developing an application where i need ipv4 IP address of the Computer.

I try this :

IPAddress LocalIp=
System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName()).AddressList[0];

this return IPV6 IP.

There are more than one IP in Address List and system (e.g computer) use one IP at a time,
then how to detect which is the primary IP (means which IP is Currently using).

Please Help.

Posted 28-Feb-11 21:25pm

sufi2008123

Updated 1-Mar-11 5:00am

v4

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Dima Popov · Answer 1 · 2011-02-28T21:41:00

Solution 1

You shouldn't just use one IP address, as there may be more than one ipv4 addresses.

List<IPAddress> localAddresses = new List<IPAddress>();

foreach (IPAddress ipAddress in Dns.GetHostEntry(Dns.GetHostName()).AddressList)
{
    if (ipAddress.AddressFamily == AddressFamily.InterNetwork) // filter out ipv4
    {
        localAddresses.Add(ipAddress);
    }
}

Posted 28-Feb-11 21:41pm

Dima Popov

Updated 28-Feb-11 23:27pm

v4

Comments

sufi2008123 1-Mar-11 10:16am

thank u very very much for u r reply...

There are more than one IP in Address List and system (e.g computer) use one IP at a time, then can u give me the idea how to detect which is the primary IP (means which IP is Currently using).

Dima Popov 1-Mar-11 15:18pm

Well, it depends. Please, provide more information about your program.

Try this link:
http://stackoverflow.com/questions/359596/identifying-active-network-interface-in-net