Function parseNetmask

packages/proxy-addr/src/index.ts:122–125

* Parse netmask string into CIDR range. * * @param netmask * @private

(netmask: string)

 * @private
 */
function parseNetmask(netmask: string) {
  const ip = parseip(netmask)
  return ip.kind() === 'ipv4' ? ip.prefixLengthFromSubnetMask() : null
}
/**
 * Determine address of proxied request.
 *