Write a JavaScript/TypeScript function that can convert IPv6 prefixes (ranging from 0 to 128) into the corresponding mask format (using the ffff:ffff style).
Here are some examples:
33 => 'ffff:ffff:8000:0000:0000:0000:0000:0000'
128 => 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff'
118 => 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:fc00'
This code snippet demonstrates a program that transforms a given prefix into an IPv6 Mask.
In the past, I relied on for various IP validations. However, I discovered that it lacks the functionality to convert prefixes into masks.
const HEX = 16;
const BINARY = 2;
const MAX_PREFIX = 128;
const MIN_PREFIX = 0;
/**
*
* @param prefix
* @returns ipv6 netmask address
*
* Fill an array with 1s for the specified number of prefix bits
* Fill the remaining bits with 0s
* Chunk the array with 16 elements and convert each chunk to hex
*
*/
static getNetmaskForPrefix(prefix: number): string {
const prefixArr: number[] = new Array(prefix).fill(1);
const chunkArr = Array.from({
length: Math.ceil(prefixArr.length / HEX),
}, (_v, i) => prefixArr.slice(i * HEX, i * HEX + HEX));
// Convert from binary to hex
let subnet = chunkArr.map((item) => {
return parseInt(item.join('').padEnd(HEX, '0'), BINARY).toString(HEX);
}).join(':');
if (subnet.length < 35) {
subnet = `${subnet}::`;
}
return subnet;
}
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