docs: def ip_in_ipmask(ip, ipmask):
      '''
      Checks whether an ip is contained in an ip subnet where the subnet is a string with the notation ip/mask (e.g. 192.168.1.1/24 or 192.168.1.1/255.255.255.0)
      '''
      mask_ip, mask = str_to_ipmask(ipmask)
      return ip_in_ip_mask(ip, mask_ip, mask)