public string GetIP(string domain) { bool isIp = KK.IsIP(domain); logger.InfoFormat("domain#{0} IsIP = {1}", domain, isIp); if (isIp) { return(domain); } IPHostEntry hostEntry = Dns.GetHostEntry(domain); IPEndPoint ipEndPoint = new IPEndPoint(hostEntry.AddressList[0], 0); return(ipEndPoint.Address.ToString()); }