NodeJS snippet for iterating the `networkInterfaces()` in the same subnet as `ip_query`

iter_subnet_matches.js

import {networkInterfaces} from 'os'
import {isIP, BlockList} from 'net'

export function * iter_subnet_matches(ip_query) {
  let family = isIP(ip_query)
  let ipv = 'ipv'+family

  for (let [if_name, if_addrs] of Object.entries(networkInterfaces())) {
    for (let each of if_addrs) {
      if (family != each.family)
        continue;

      let [net, width] = each.cidr.split('/',2)
      let bl = new BlockList()
      bl.addSubnet(net, +width, ipv)
      if (bl.check(ip_query, ipv))
        yield each
    }
  }
}

if ('demo') {
  let addr = '172.17.7.23'
  for (let match of iter_subnet_matches(addr))
    console.log({addr, match})
}