Get currently working ip address

Question

I am seeking for a solution which allows me to get the currently working/(in use) ip address of my pc/laptop.

What I mean is I might be in LAN and then switch to WLAN. The ip addy will change and I need to stay up to date.

That is why I am not happy with approaches I found on the internet like IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());

What is the best approach for this?

that is how to obtain local ip address.. its not the same. I am asking for currently in use — dev hedgehog, Jul 07 '15 at 08:46
Try this : System.Web.HttpContext.Current.Request.UserHostAddress — Fabjan, Jul 07 '15 at 08:49
As far as I know there is no reliable method to figure this out from within the LAN. See https://en.wikipedia.org/wiki/STUN — C.Evenhuis, Jul 07 '15 at 08:52
Why do you "need" this information and how will you use it? By the time your program obtains the information, it may be out of date (because connecting/disconnecting from networks are outside of the control of your program) — Damien_The_Unbeliever, Jul 07 '15 at 08:54
Please look into https://stackoverflow.com/questions/6803073/get-local-ip-address also. — Anonymous Platypus, Jul 07 '15 at 08:55

rdoubleui · Accepted Answer · 2015-07-07T09:12:16.283

You can look up the active interfaces of the machine like this:

var interfaces = NetworkInterface.GetAllNetworkInterfaces().Where(a => a.OperationalStatus == OperationalStatus.Up);

var addresses = interfaces.First().GetIPProperties().UnicastAddresses.Where(a => a.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork);

The Address property of any item in addresses holds the ip. From there you could monitor the adapters and decide when you need to switch over and what address to bind to.

Get currently working ip address

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