docs: def cmd(send, msg, args):
      """Gets a CIDR range.
  
      Syntax: {command} <range>
  
      """
      if not msg:
          send("Need a CIDR range.")
          return
      try:
          ipn = ip_network(msg)
      except ValueError:
          send("Not a valid CIDR range.")
          return
      send("%s - %s" % (ipn[0], ipn[-1]))