[C#]
string s ='';
System.Net.IPAddress[] addressList = Dns.GetHostByName(Dns.GetHostName()).AddressList;
for (int i = 0; i < addressList.Length; i ++)
{
s += addressList[i].ToString() + '\n';
}
textBox1.Text = s;
[VB.NET]
Dim s As String = ''
Dim addressList As System.Net.IPAddress() = Dns.GetHostByName(Dns.GetHostName()).AddressList
Dim i As Integer
For i = 0 To addressList.Length - 1
s += addressList(i).ToString() + ControlChars.Lf
Next i
textBox1.Text = s
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