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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchAvoid 1234, 0000, 2580, 1111 and 5555—and steer clear of repeated digits, keypad patterns, reversals and personally meaningful dates or years. These choices are easy to remember, which also makes them sensible early guesses. A randomly generated PIN, used only once, is a better choice; if the device or service supports it, consider a longer alphanumeric passcode while keeping retry and lockout protections enabled.
Which four-digit PINs should you avoid?
Ruhr University Bochum identified these as the most common four-digit PINs in its 2020 study:
- 1234
- 0000
- 2580—the digits run down the middle column of a typical numeric keypad.
- 1111
- 5555
Other patterns observed by USENIX researchers in 2022 included 2468, 1212 and 6969, as well as years such as 1995 and 2020. Avoid the broader patterns too, not just the codes on a short list: repeated digits, ascending or descending runs, keypad shapes, reversals such as 4321, and mirrored pairs such as 1221.
Why are these PINs easy to guess?
People do not choose four-digit codes uniformly at random. Sequences are quick to enter, repeated digits are easy to remember, and keypad paths such as 2580 have a visible shape. Birthdays, anniversaries and years are memorable for the same reason. Because choices cluster around familiar patterns, an attacker may sensibly try them before less predictable combinations.
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That does not mean a particular PIN guarantees compromise. The practical risk also depends on how many attempts a device or service permits, its lockout behavior and the quality of any blocklist that rejects common choices.
Is 1234 really that easy to guess? What about 0000 and 2580?
Yes: the figures reported by ABC News Australia in 2025 show how concentrated choices can be. In the observed four-digit codes it discussed, 1234 accounted for 9.0%, 0000 for 1.1% and 2580 for 0.2%. Those are shares of that observed set, not a probability that an attacker will get into any particular device or account.
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0000 is a poor choice because repeated digits are a conspicuous pattern. 2580 is not made safe by avoiding a date: it traces a straight keypad path and appeared among commonly selected PINs. A code need not contain personal information to be predictable.
How to choose and protect a PIN
- Generate it randomly. Do not invent a code from a sequence, date or keypad shape. Use a trustworthy random method rather than a memorable pattern.
- Reject recognizable structures. Avoid repeated digits, ascending or descending runs, reversals, mirrored patterns and paths across the keypad.
- Keep personal numbers out. Do not use birth years, anniversaries, address numbers, phone fragments or the last four digits of an identity number.
- Use a different PIN for every purpose. A phone, bank card, alarm, door lock and account should not share one code. Reuse means one exposed PIN can put other protections at risk.
- Use a longer alphanumeric passcode if supported. Keep retry limits and lockout protections enabled rather than trading those controls away for convenience.
Are six-digit PINs safer than four-digit PINs?
A six-digit code has more possible combinations if every digit is selected randomly: 1,000,000 possibilities from 000000 through 999999, compared with 10,000 four-digit strings from 0000 through 9999. But the larger theoretical space does not guarantee better real-world security when people choose predictable patterns or reuse codes.
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An IEEE Symposium on Security and Privacy study published in 2020 found that six digits can provide little or no extra security against attackers constrained by throttling, and can sometimes reduce security because users select patterns. The practical comparison depends on the code’s randomness, retry limits and lockout behavior, whether common choices are blocked, and whether a longer code leads someone to choose a guessable pattern or reuse it. A random six-digit PIN is preferable to a predictable one, but length alone is not a substitute for unpredictable selection and effective attempt controls.
Quick Recap
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