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"use client"
import React, { useState } from 'react';
import { Netmask } from 'netmask';
export default function Cidr() {
const [ip, setIp] = useState([10, 88, 135, 144]);
const [cidr, setCidr] = useState(28);
const [cols] = useState(["bg-purple-400", "bg-red-400", "bg-green-400", "bg-yellow-400"]);
const bits = ip.map(octet => Array.from({ length: 8 }, (_, i) => (octet >> (7 - i)) & 1));
const parseOctet = (val: string, max: number) => {
const num = parseInt(val);
if (isNaN(num) || num < 0) return 0;
if (num > max) return max;
return num;
}
const setIpOctet = (i: number, val: number) => {
const newIp = [...ip];
newIp[i] = val;
setIp(newIp);
}
const pretty = ip.join('.') + '/' + cidr;
const netmask = new Netmask(pretty);
const details = {
"Netmask": netmask.mask,
"CIDR Base IP": netmask.base,
"Broadcast IP": netmask.broadcast,
"Count": netmask.size.toLocaleString(),
"First Usable IP": netmask.first,
"Last Usable IP": netmask.last
}
return (
<div className="min-h-screen flex flex-col items-center justify-center bg-gray-100 p-4">
<div className="max-w-5xl w-full p-8">
<h1 className="text-4xl font-bold tracking-tight text-gray-900 sm:text-6xl">
IP / CIDR Calculator
</h1>
<div className="my-6 text-lg leading-8 text-gray-600">
<p><a href="https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing">CIDR</a> is a notation for describing
blocks of IP addresses and is used heavily in various networking configurations.</p>
<p>IP addresses contain 4
octets, each consisting of 8 bits giving values between 0 and 255. The decimal value that comes after the
slash is the number of bits consisting of the routing prefix.</p>
<p>This in turn can be translated into a netmask,
and also designates how many available addresses are in the block.</p>
</div>
<div className="flex flex-wrap justify-center gap-4 my-8">
{ip.map((octet, i) => (
<div key={`octet-${i}`}>
<input
key={`inp-${i}`}
type="text"
value={octet}
onChange={(e) => setIpOctet(i, parseOctet(e.target.value, 255))}
className={`w-20 h-20 text-3xl text-center rounded-md ${cols[i]}`}
maxLength={3}
/>
<span className="text-5xl pl-4" key={`sep-${i}`}>{i == 3 ? "/" : "."}</span>
</div>
))}
<input
type="text"
key={`inp-cidr`}
value={cidr}
onChange={(e) => setCidr(parseOctet(e.target.value, 32))}
className="w-20 h-20 text-3xl text-center rounded-md bg-slate-300"
maxLength={2}
/>
</div>
<div className="text-center text-xl mb-8">
<div className="bits text-xs">
{bits.map((octet, i) => <span key={`octet-${i}`} className="px-4">
{octet.map((bit, j) => <span key={`octet-${i}-bit-${j}`} className={`font-mono border-y ${j == 0 && "border-l"} border-r border-gray-700 px-2 py-1 ${cols[i]}`}>{bit}</span>)}
</span>)}
</div>
</div>
<div className="text-center text-xl mb-8 grid grid-cols-1 sm:grid-cols-3 gap-4">
{Object.entries(details).map(([label, val]) =>
<div className="p-3" key={`detail-${label}`}>
<div className="font-mono">{val}</div>
<div className="text-lg font-bold tracking-tight text-gray-900 sm:text-3xl">{label}</div>
</div>)
}
</div>
</div>
<footer className="flex justify-center space-x-4">
<a href="#" className="flex items-center text-blue-600 hover:underline">
GitHub
</a>
<a href="#" className="flex items-center text-blue-600 hover:underline">
About
</a>
</footer>
</div >
);
}
|
