The only working Club Penguin membership codes generator in June 2016.
ClubPenguinMembership.org is a service which provides 7-day membership codes for users at Club Penguin. This is not a hacking tool and does not violate any computing laws, or abuse Club Penguin servers in any way. It simply retrieves codes from a list which have been harnessed from Club Penguin's past free offers for these codes, hence why they are limited. This does not steal any revenue from Disney Club Penguin, especially as they are only 7-day memberships aren't even available for purchase.