获取IP -详细内容 - 黄兵的个人博客

文章内容

2017/9/1 9:00:24,作者: 黄兵

获取IP

///
/// 获取用户的IP地址
///
public static string GetIP()
{
    string user_IP = HttpContext.Current.Request.Headers["X-Forwarded-For"];
    if (user_IP != null && user_IP.ToLower() != "unknown")
    {
        //X-Forwarded-For: client1, proxy1, proxy2    
        string[] arrIp = user_IP.Split(',');
        user_IP = arrIp[0];
        if (arrIp.Length > 1)
        {
        //如果第一组IP是10和192.168开头还有172.16-172.31
        //（第二码区间在16-31之间）的话，就取第二组IP
            if (user_IP.IndexOf("10.") == 0 || user_IP.IndexOf("192.168.") == 0 ||
                (user_IP.IndexOf("172.") == 0 && (user_IP.Split('.').Length > 1 
                && Convert.ToInt32(user_IP.Split('.')[1]) > 15 &&
                    Convert.ToInt32(user_IP.Split('.')[1]) < 32)))
            {
                user_IP = arrIp[1];
            }
        }
    }
    else if (HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"] != null &&
                HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToLower() != "unknown")
    {
        user_IP = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
    }
    else
    {
        user_IP = HttpContext.Current.Request.UserHostAddress;
    }
    //ipv6的地址要全部存入
    //if (user_IP.Length > 15)
    //{
    //    user_IP = user_IP.Substring(0, 15);
    //}
    Regex reip = new Regex("(\\d+).(\\d+).(\\d+).(\\d+)");
    return reip.Replace(user_IP, "$1.$2.$3.$4");
}


    ///
    /// IP最后一码用星号表示
    ///
    ///
    ///
    public static string GetIPString(string ipString)
    {
        Regex reip = new Regex("(\\d+).(\\d+).(\\d+).(\\d+)");
        return reip.Replace(ipString, "$1.$2.$3.*");
    }