4CM Network has been developing social & security software since 1996.

Known Passwords Search:

You can use the below form to see if a password is a commonly used password - a password that exists within available 'known password' lists that most password hackers use while trying to hack passwords.

There are over 170 million passwords within the list that we check against.

If the password is found within our list you should consider something more secure.

Please note that the following are not searched for:

  1. Email addresses (because if you use your email address as your password, you deserve to have your account hacked)
  2. Any password that contain less than 8 characters (most passwords under 8 characters can be hacked in less than one-tenth of a second, so why even bother - change to a more secure password)
  3. Any password that is over 40 characters in length (there are no known passwords within our 170+ million passwords that are 40+ characters)

History:

August 02, 2015 - Added an additional 58 million passwords taking our list to over 170 million passwords.

March 02, 2015 - To celebrate the birthday of Dr. Seuss, we have added an additional 14 million passwords to our list, taking our list of passwords to over 111 million passwords! We have an additional 56 million passwords that we are cleaning up and hope to have added to our database in a few weeks.

November 20, 2013 -- Thanks to somebody that shared with us two massive lists of passwords from PlentyOfFish and CupidMedia we have increased our list by 72+ million passwords, taking us to over 94 million known passwords that are queried!

November 18, 2013 -- Added an additional 3.1 million passwords to our list, taking us to over 21.9 million known passwords that are queried!

November 09, 2013 -- Added an additional 4.2 million passwords to our list, taking us to over 18.8 million known passwords that are queried!

April 03, 2012 -- Added an additional 301,253 passwords to our list, taking us to over 14.6 million passwords!