Method: Ip#cidr

Defined in:
lib/ipcalc/Ip.rb

#cidr(in_class) ⇒ Object

Return the CIDR of a given subnet’s class that contains this IP address.

in_class

Class of the subnet (example: 26).

The method returns the CIDR of the given class that contains this IP address.

Raises:

  • (RuntimeError) 


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# File 'lib/ipcalc/Ip.rb', line 237

def cidr(in_class)
  max_class = MAX_CLASS()
  raise RuntimeError, "Invalid subnet class /#{in_class}" if (in_class > max_class || in_class < 1)
  mask = (2**in_class - 1) << (max_class - in_class)
  Iptools.i_to_dots(@ip_int & mask, @version) + "/#{in_class}" 
end