golang-github-apparentlymart-go-cidr-dev 1.0.0+git20180915.1755c02-2 (amd64 binary) in ubuntu eoan

 This Go package is a collection of assorted utilities for computing network
 and host addresses within network ranges.
 .
 It expects a CIDR-type address structure where addresses are divided into
 some number of prefix bits representing the network and then the remaining
 suffix bits represent the host.
 .
 For example, it can help to calculate addresses for sub-networks of a parent
 network, or to calculate host addresses within a particular prefix.
 .
 At present this package is prioritizing simplicity of implementation and
 de-prioritizing speed and memory usage. Thus caution is advised before using
 this package in performance-critical applications or hot codepaths.
 Patches to improve the speed and memory usage may be accepted as long as they
 do not result in a significant increase in code complexity.