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C#でローカルIP/グローバルIPを取得する

Last updated at Posted at 2023-01-11

ローカルIPの取得

using System.Net;

string hostname = Dns.GetHostName();

IPAddress[] adrList = Dns.GetHostAddresses(hostname);
foreach (IPAddress address in adrList)
{
    Console.WriteLine(address.ToString());
}

グローバルIPの取得

グローバルIPをプログラムで取得するのは困難なため、外部サイトを利用します.

using System.Net;

string externalIpString = new WebClient().DownloadString("https://ipinfo.io/ip");
var externalIp = IPAddress.Parse(externalIpString);

Console.WriteLine(externalIp.ToString());

以上です.

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