验证IP地址不是0.0.0.0或多播地址 [英] Validate IP address is not 0.0.0.0 or multicast address

问题描述

使用JavaScript如何验证IP地址x.x.x.x是有效的IPV4单播地址，例如不是0.0.0.0或多播（224.0.0.0到224.0.0.255,224.0.1.0到238.255.255.255,239.0.0.0到239.255.255.255）？

Using JavaScript how would I validate an IP address "x.x.x.x" is a valid IPV4 unicast address e.g. is not 0.0.0.0 or multicast (224.0.0.0 to 224.0.0.255, 224.0.1.0 to 238.255.255.255, 239.0.0.0 to 239.255.255.255)?

推荐答案

首先你需要把它变成一个数字，使用这个函数： -

First you need to get it into a number, use this function:-

function IPToNumber(s)
{
    var arr = s.split(".");
    var n = 0
    for (var i = 0; i < 4; i++)
    {
        n = n * 256
        n += parseInt(arr[i],10)

    }
    return n;
}

看看你的规格，虽然你似乎列出了一系列范围似乎与我连续，可以简化为（224.0.0.0至239.255.255.255）。因此，你可以测试： -

Looking at you spec, whilst you seem to list a series of ranges those ranges appear to be contiguous to me, that is can be simplified to (224.0.0.0 to 239.255.255.255). Hence you can test with:-

var min = IPToNumber("224.0.0.0");
var max = IPToNumber("239.255.255.255");

var ipNum = IPToNumber(sTestIP);

var isValid = (ipNum != 0 && (ipNum < min || ipNum > max))

当然注意，如果不知道目的地子网，则无法判断该地址是该子网的网络地址还是广播地址。

Note of course that without knowledge of the destinations subnet you can't tell whether the address is the network address or the broadcast address for that subnet.

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