npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@blueking/ip_subnet_divider

v1.0.4

Published

ip subnet divider

Downloads

3

Readme

@blueking/ip_subnet_divider

IPV4 CIDR 子网划分计算工具用于从给出的 IP 地址块子网数,计算出 主机数子网掩码子网主机范围子网主机数子网网段子网广播地址

快速开始

安装

npm i @blueking/ip_subnet_divider

使用

import calculator from "@blueking/ip_subnet_divider";
const {
    ipMask,
    ipCIDR,
    subnets
} = calculator('10.0.0.1/8', 8);

原理

下面举两个例子:

例1、要将网络地址块 10.0.0.0/8 划分成 8 个子网。

10.0.0.0/8 的主机号长度为 24,因此主机数有 2^24 = 16777216 个。

因为要划分成 8 个子网,因此需要拿出 3 位作为子网网段,因此子网掩码是 255.244.0.0/11。

子网网段的二进制表示可能性有:

111、110、101、011、100、010、001、000

因此,可以计算出对应的子网网络号

因为,最小的地址可以表示成 0000000.......0000001

最大的地址可以表示成 000(共11个0)...001111111.....111110

所以,只要用上述计算出的 8 个子网网络号与 最小地址 和 最大地址进行 按位或运算 就可以得到每个子网网段的主机地址范围了,

其中,可以顺便算出子网的网络号和广播地址,

主机号二进制位全0的地址是网络号,全1的地址是广播地址。

例2、要将网络地址块 192.168.1.0/24 划分成 4 个子网

借助上述思路,可以计算出结果: