1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
"use client"
import React, { useEffect, 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", "bg-slate-300"]);
const [isShared, setIsShared] = useState(false);
const bits = ip.map(octet => Array.from({ length: 8 }, (_, i) => (octet >> (7 - i)) & 1));
const parseOctet = (val: string, max: number) => {
const num = Number(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 handleWheel = (event: React.WheelEvent<HTMLInputElement>, i: number, max: number) => {
event.preventDefault();
const min = 0;
const target = event.currentTarget as HTMLInputElement;
let value = parseInt(target.value);
if (event.deltaY > 0 && value > min) {
value -= 1;
}
if (event.deltaY < 0 && value < max) {
value += 1;
}
if (i == 4) {
setCidr(value);
}
else {
setIpOctet(i, value);
}
}
const handleKeyDown = (event: React.KeyboardEvent<HTMLInputElement>, i: number, max: number) => {
const min = 0;
const target = event.currentTarget as HTMLInputElement;
let value = parseInt(target.value);
if (event.key == "ArrowDown" && value > min) {
value -= 1;
}
if (event.key == "ArrowUp" && value < max) {
value += 1;
}
if (i == 4) {
setCidr(value);
}
else {
setIpOctet(i, value);
}
}
const handleShare = async () => {
const frag = "#" + ip.join(".") + "/" + cidr;
window.location.hash = frag;
await navigator.clipboard.writeText(window.location.toString());
setIsShared(true);
setTimeout(() => setIsShared(false), 2000);
};
useEffect(() => {
const fragment = window.location.hash.slice(1);
if (fragment) {
const parts = fragment.split("/");
const ip = parts[0].split(".").map(Number);
const cidr = Number(parts[1]);
if (ip.length != 4) {
return
}
ip.forEach(octet => {
if (octet < 0 || octet > 255) {
return
}
})
if (cidr < 0 || cidr > 32) {
return
}
setIp(ip);
setCidr(cidr);
}
}, []);
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-2">
<div className="max-w-6xl w-full sm:p-8 p-2">
<h1 className="my-3 sm:my-1 text-center sm:text-left text-4xl font-bold tracking-tight text-gray-900 sm:text-6xl">
IP / CIDR Calculator
</h1>
<div className="my-6 border-0 sm:border border-gray-300 rounded-lg">
<div className="flex flex-wrap justify-center gap-4 my-10">
{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))}
onWheel={(e) => handleWheel(e, i, 255)}
onKeyDown={(e) => handleKeyDown(e, i, 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))}
onWheel={(e) => handleWheel(e, 4, 32)}
onKeyDown={(e) => handleKeyDown(e, 4, 32)}
className={`w-20 h-20 text-3xl text-center rounded-md ${cols[4]}`}
maxLength={2}
/>
</div>
<div className="flex flex-wrap justify-center gap-4 mt-10">
{bits.map((octet, i) => <span key={`octet-${i}`} className="px-1">
{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 ${i * 8 + j < cidr ? cols[i] : cols[4]}`}>{bit}</span>)}
</span>)}
</div>
<div className="text-center text-xl mt-8 grid grid-cols-1 sm:grid-cols-3 gap-4">
{Object.entries(details).map(([label, val]) =>
<div className="sm:p-3 " key={`detail-${label}`}>
<div className="font-mono">{val}</div>
<div className="font-bold tracking-tight text-slate-500 sm:text-3xl text-2xl">{label}</div>
</div>)
}
</div>
<div className="flex justify-end p-5">
<button
onClick={handleShare}
className="flex items-center gap-2 px-4 py-2 text-sm text-gray-100 bg-blue-500 rounded-md hover:bg-blue-600"
>
{isShared ? "Copied!" : "Share"}
</button>
</div>
</div>
<div className="my-6 text-lg leading-8 text-slate-900">
<p>CIDR (Classless Inter-Domain Routing) notation is a compact method for specifying IP address ranges and network masks. It is widely used in network configuration and management.</p>
<p>An IP address consists of 4 octets, each containing 8 bits that represent values from 0 to 255. In CIDR notation, a forward slash (/) followed by a number indicates the length of the network prefix in bits.</p>
<p>This prefix length determines the network mask and the number of available host addresses within the specified IP range. This calculator helps you visualize and understand these CIDR blocks, making network planning and configuration easier.</p>
</div>
</div>
<footer className="text-left">
<p>Created by <a href="https://yuv.al" className="text-blue-600 hover:underline">Yuval Adam</a>. Source available on <a href="https://github.com/yuvadm/cidr.xyz" className="text-blue-600 hover:underline">Github</a>.</p>
</footer>
</div >
);
}
|
