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mask.rb
This Ruby code snippet demonstrates how to use the IPAddr class in the ipaddr gem to create an IP address object and generate a sequence of subnet masks for it.
The code first requires the ipaddr gem by calling require 'ipaddr'. It then creates an instance of the IPAddr class with the string '255.255.255.255/32' using the constructor method new(). The resulting object, stored in the variable ip, is then used to generate a sequence of subnet masks by calling the mask() method 33 times and passing each time the index of the iteration as an argument.
Inside the block passed to times(), the puts method is called with two arguments: the current value of the index (i) and the result of the mask() method call for that index, which returns a string representation of the subnet mask. The resulting output is displayed on the console.
The resulting subnet mask sequence will be in CIDR format (e.g., ‘255.255.255.255/32’) and will include 33 different values, each representing a different subnet mask with a prefix length of 32.
Ruby code snippet
require 'ipaddr'
#=> true
ip = IPAddr.new('255.255.255.255/32')
#=> #<IPAddr: IPv4:255.255.255.255/255.255.255.255>
33.times { |i| puts "#{i}\t#{ip.mask(i)}" }
0 0.0.0.0
1 128.0.0.0
2 192.0.0.0
3 224.0.0.0
4 240.0.0.0
5 248.0.0.0
6 252.0.0.0
7 254.0.0.0
8 255.0.0.0
9 255.128.0.0
10 255.192.0.0
11 255.224.0.0
12 255.240.0.0
13 255.248.0.0
14 255.252.0.0
15 255.254.0.0
16 255.255.0.0
17 255.255.128.0
18 255.255.192.0
19 255.255.224.0
20 255.255.240.0
21 255.255.248.0
22 255.255.252.0
23 255.255.254.0
24 255.255.255.0
25 255.255.255.128
26 255.255.255.192
27 255.255.255.224
28 255.255.255.240
29 255.255.255.248
30 255.255.255.252
31 255.255.255.254
32 255.255.255.255
#=> 33
Executed with Ruby 3.4.4.