docs: def mcast_ip(ip_addr, return_tuple=True):
      """
      Function to check if a address is multicast
      Args:
          ip_addr: Multicast IP address in the following format 239.1.1.1
          return_tuple: Set to True it returns a IP, set to False returns True or False
  
      Returns: see return_tuple for return options
  
      """
      regex_mcast_ip = __re.compile("^(((2[2-3][4-9])|(23[0-3]))\.((25[0-5])|(2[0-4][0-9])|(1[0-9][0-9])|([1-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|(1[0-9][0-9])|([1-9]?[0-9]))\.((25[0-5])|(2[0-4][0-9])|(1[0-9][0-9])|([1-9]?[0-9])))$")
      if return_tuple:
          while not regex_mcast_ip.match(ip_addr):
              print("Not a good multicast IP.")
              print("Please try again.")
              ip_addr = input("Please enter a multicast IP address in the following format x.x.x.x: ")
          return ip_addr
      elif not return_tuple:
          if not regex_mcast_ip.match(ip_addr):
              return False
          else:
              return True