Get IPv4 addresses from Dns.GetHostEntry()

user_81205 0
Viewed 113861

I've got some code here that works great on IPv4 machines, but on our build server (an IPv6) it fails. In a nutshell:

IPHostEntry ipHostEntry = Dns.GetHostEntry(string.Empty);

The documentation for GetHostEntry says that passing in string.Empty will get you the IPv4 address of the localhost. This is what I want. The problem is that it's returning the string "::1:" on our IPv6 machine, which I believe is the IPv6 address.

Pinging the machine from any other IPv4 machine gives a good IPv4 address... and doing a "ping -4 machinename" from itself gives the correct IPv4 address.... but pinging it regularly from itself gives "::1:".

How can I get the IPv4 for this machine, from itself?

ipv6 ipv4 dns .net c#
8 Answers
user_1059290

You can get all IPv4 address from the DNS using this code:

IPs[] ipv4Addresses = Array.FindAll(
           Dns.GetHostEntry(string.Empty).AddressList,
           address => address.AddressFamily == AddressFamily.InterNetwork);
user_163009340
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