using System;

using System.Net;

public class Program

{

    public static void Main()

    {

        var ipList = new string[] {

            "192.168.1.1",

            "2601:182:ce00:46e0:ec8f:c203:d39a:93b3",

            "REDACTED"

        };

        foreach(var ip in ipList) {

            var valid = ip is null or "REDACTED" || IPAddress.TryParse(ip, out _);

            Console.WriteLine(valid);

        }

    }

}