A standard text file ( .txt ) containing all 1,000,000 combinations, with one code per line followed by a line break, requires roughly 7 Megabytes (MB) of storage space. This small footprint makes it incredibly easy to store, transfer, and load into memory. Range: The list starts at 000000 and concludes at 999999 . How 6-Digit OTP Wordlists are Generated
A secure application will track the number of failed authentication attempts. If an IP address or a specific user account inputs an incorrect OTP more than 3 to 5 times sequentially, the system will temporarily lock the account or ban the IP address. Trying to run a 1,000,000-entry wordlist under these conditions would take weeks or fail entirely after the first few attempts. Short Time-To-Live (TTL)
In professional penetration testing, 6-digit wordlists are generated using tools like crunch or simple Python scripts to verify that a system's policy is functioning correctly. Summary of Wordlist Properties Total Combinations Entropy ~19.93 Bits Format Numeric (0-9) Common Use 2FA, SMS Verification, Banking If you'd like to dive deeper, I can provide: A Python script to generate a custom range for testing. More details on TOTP vs. HOTP algorithms.
When people manually choose PINs or memorize OTPs (if an app allows static backups), they lean on predictable patterns. Security researchers have analyzed leaked password databases and OTP generation habits. The results are startling:
Many systems (especially poorly configured web apps) have a flaw: they don’t rate-limit OTP attempts aggressively enough. An attacker who already has a victim’s username and password (stolen via phishing or a data breach) will trigger an OTP request to the victim’s phone. Then, armed with a 6-digit wordlist, the attacker launches an automated script that tries the top 500 codes (like 123456 , 111111 , etc.) within the 60-second window. If the victim chose a weak OTP seed or the system has a long validity window (e.g., 5 minutes), the attacker breaks in. 6 digit otp wordlist
It is important to note that testing these methods on systems without explicit permission is illegal. Conclusion
. These lists are typically used for cybersecurity testing, such as fuzzing or verifying the rate-limiting capabilities of an authentication system. Key Specifications Total Combinations : There are exactly possible 6-digit codes (10^6). Success Rate
An OTP is composed of independent numerical positions. Each digit in the code can be any whole number from possible choices per slot.
SecLists/Fuzzing/6-digits-000000-999999. txt at master · danielmiessler/SecLists · GitHub. 6-digits-000000-999999.txt - Karanxa/Bug-Bounty-Wordlists A standard text file (
A 6-digit OTP wordlist is only effective against systems with the following flaws: One-time passwords (OTP) - Security - MDN Web Docs
Imagine a digital vault protected by a 6-digit code. A hacker doesn't need to "guess" your specific code if they have a script that runs through a wordlist. The Script: An automated tool feeds the wordlist into a login field. The Speed: High-speed scripts can test hundreds of codes per second.
The command above instructs Crunch to create a list with a minimum and maximum length of 6 characters, using only the digits 0-9, and save it to "otp_list.txt". The Role of Wordlists in Penetration Testing
: Use web application firewalls (WAFs) to monitor and block IP addresses that submit rapid API requests to authentication endpoints. How 6-Digit OTP Wordlists are Generated A secure
: Often ordered by probability (e.g., placing "123456" or "111111" first) to test for common vulnerabilities and weak generation algorithms. Predictive Entropy Testing
Understanding the entropy and predictability of generated codes. The Myth of Brute-Forcing OTPs
Once the patterns are defined, how are these lists actually created? Security professionals use a variety of command-line tools and specialized password list generators.