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Trying to get local IP address in VB 2010 - Can't get System.Net.Dns.GetHostEntry to work like System.Net.Dns.Resolve

After 2 hours of trying to do the simplest thing (finding the ip address of the local machine) and searching and searching but getting nowhere fast, I decided to ask my question here.

Apparently, System.Net.Dns.Resolve() is obsolete and I should use System.Net.Dns.GetHostEntry() instead.

I read that GetHostEntry() can simply be used instead of Resolve() as the paramaters and return types are the same but they're not.

Dim myHostName As String = System.Net.Dns.GetHostName()

Dim myIPAddress As String = System.Net.Dns.Resolve(myHostName).AddressList(0).ToString() returns "" which is what I want.


Dim myIPAddress As String = System.Net.Dns.GetHostEntry(myHostName).AddressList(0).ToString() returns "fe80::112:6c34:8cc7:492d%10" which is Greek to me.

I gave up and left it using Resolve() but was hoping that someone could show me how to do it with a non-obsolete function.


Environment: VB.Net / Visual Studio 2010 / Windows Forms Application on Win 7 x64
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1 Solution
The IPHostEntry will populate IPv6 address information as well so you can have multiple address entries in the AddressList. You can filter to return only IPv4 by checking the AddressFamily specifically Sockets.InterNetwork here is more information about AddressFamily enumeration http://msdn.microsoft.com/en-us/library/system.net.sockets.addressfamily.aspx
Dim entry As IPHostEntry = Dns.GetHostEntry(String.Empty)
        For Each ip As IPAddress In entry.AddressList
            ' Only display ipv4 address
            If ip.AddressFamily = Sockets.AddressFamily.InterNetwork Then
            End If

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ou81aswellAuthor Commented:
Thanks. I didn't realize the list contained different address families.

I'm confused about there being 3 addresses in my address list. Which IP address is the one that Internet Explorer uses to browse the web?
The IPAddress returned that looks like is your computers network address usually obtained automatically from your DHCP server/router. May I ask what your real goal is because GetHostEntry() might not be what your looking for depending on what your trying to accomplish in your application. Could you elaborate?
ou81aswellAuthor Commented:
I have a client app and a server app that use sockets to talk to each other across my LAN.

They talk together well.

I want to put the local IP address in the title bar of both apps
ou81aswellAuthor Commented:
Thanks. Still not sure whic IP address to use. It appears that it's the first one.
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