借用上面Michele评论中的链接问题中的函数，您可以将first-last地址转换为数字，然后在数字范围内转换以创建数组：

function addrToNum(addr) {
  return addr.split(".").reduce((acc,cur,i)=> acc += (Number(cur) << ( (3-i) * 8) ) ,0)
}
function numToAddr(num) {
  return [(num >>> 24), (num >>> 16) & 0xFF, (num >>> 8) & 0xFF, (num & 0xFF)].join(".")
}

const [firstIp, lastIp] = "70.103.242.28-70.103.242.30".split("-")
const firstNo = addrToNum(firstIp)
const lastNo = addrToNum(lastIp)
console.info(`Start: ${firstNo}, Stop: ${lastNo}`)

let ipArray = []
for (let ipNo = firstNo; ipNo <= lastNo; ipNo++) {
  let ipAddr = numToAddr(ipNo)
  ipArray.push(ipAddr)
}
console.info(`Array: [${ipArray}]`)

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将此ipArray传递给CIDR.getBlocks函数（未测试）：

const CIDR = require("cidr-js");
const cidr = new CIDR();
let ipBlocks = cidr.getBlocks(ipArray);

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