Javascript NETMASK and CIDR conversion

Question

I was expecting to find hundreds of examples of functions to convert to and from CIDR and NETMASK for javascript, but was unable to find any.

I need to convert to and from CIDR and NETMASKS on a nodejs page which sets and retrieves the IP address for a machine using NETCTL.

Any easy solutions to do this using javascript / nodejs ??

Answer 1

Here's one that doesn't check if the netmask is valid:

const netmaskToCidr = n => n
  .split('.')
  .reduce((c, o) => c - Math.log2(256 - +o), 32)