Dns.GetHostAddresses() only returns IPv6 addresses . How to get Local IPv4?

1
votes

According to Dotnet reference , 

Dns.GetHostAddresses("")

should return IPv4 addresses . However I am getting only IPv6 on my windows 7 machine. I tried the program on a different windows 7 still the same result. It only returned IPv4 correctly on an XP machine.

If I try , 

Dns.GetHostEntry("");

It now correctly returns one IPv4 and one IPv6 . How do I get IPv4 from GetHostAddresses() because I don't want to use GetHostEntry(). It looks up the DNS.

Also, say for a computer with 1 Network card, the code returns an array of 2 identical IPv6 . Is this normal ?

1
c#.netip-addressipv6ipv4
What have you tried..? have you tried looking here first MSDN GetHostAddres – MethodMan
I tried Dns.GetHostAddresses("") , but I got results which were unexpected as I described above. I hope someone can give me a clue. – user1502776

1 Answers

2
votes

This works for me:

IPHostEntry ipHostEntry = Dns.GetHostEntry("example.com");
IPAddress ipAddress = ipHostEntry.AddressList.First(a => a.AddressFamily == AddressFamily.InterNetwork); // ipv4

It's normal to have two ipv6 addresses, one which contains your MAC address which guarantees its uniqueness, and another which doesn't to increase your privacy/security. But I don't know why yours would be identical.