convert baicells IMSI to Mac

imsiToMac.js

// starting number is the first IMSI number on the sim card package of 10
// function will create and return two arrays - first array is the 10 sequential IMSIs, second array is the 10 MACs
// it will also print a  nice table for you
// you can run it in the browser console
// just copy past and then call it like this 
// createArrays(xxxxxIMSIxxxxx)
function createArrays(startingNumber) {
    // Generate first array
    let array1 = [];
    for(let i = 0; i < 10; i++) {
        array1.push(startingNumber + i);
    }

    // Function that converts numbers to MAC-address like format
    function IMSItoMAC(number) {
        var strnum = number.toString();
        if (!strnum || strnum.length !== 15) return null;
        var last12 = strnum.substr(strnum.length - 12);
        var result;

        if (strnum[3] === '0') {
            result = '8A0' + Number(last12).toString(16).toUpperCase();
        } else {
            result = '8A' + Number(last12).toString(16).toUpperCase();
        }
        return result.match(/.{2}/g).join(':');
    }

    // Generate second array based on the first one by transforming numbers to MAC-address like format
    let array2 = [];
    for(let i = 0; i < array1.length; i++) {
        let result = IMSItoMAC(array1[i]);
        if(result !== null) array2.push(result);
    }

    // Create a data object
    let data = array1.map((e, i) => ({ 'IMSI': e, 'MAC': array2[i] }));
    console.table(data);

    // Return both arrays
    return [array1, array2];
}