Unlike complex cryptographic wordlists (like RockYou, which contains leaked human-generated passwords), a 6-digit OTP wordlist is finite, predictable, and simple to generate. How to Generate a 6-Digit Wordlist for Free
When an application falls victim to an OTP brute-force simulation, it generally points to systemic failures in backend business logic. Penetration testing typically uncovers three primary flaws: 1. Absence of Rate Limiting
A 6-digit OTP wordlist is a sequential or randomized list of every possible numerical combination from 000000 to 999999 . Because there are exactly 1,000,000 possible combinations, these lists are often used in security research and penetration testing to simulate brute-force attacks. Free 6-Digit Wordlist Resources
What Is a 6-Digit Code? Uses, Security & Best Practices Explained
Theoretically, a complete 6-digit OTP wordlist contains (from 000000 to 999999). The size of such a plain text file is approximately 7.6 MB (uncompressed) – relatively small by modern computing standards. 6 digit otp wordlist free
A 6-digit One-Time Password (OTP) wordlist is a sequential list of every possible numerical combination from . In cybersecurity, these lists are primarily used for penetration testing brute-force simulation to verify the strength of authentication systems. 1. Technical Overview Total Combinations: 10 to the sixth power (1,000,000 unique codes). File Size:
: Avoid using easily guessable sequences like 123456 , 111111 , or 121212 for actual PINs, as these are often the first entries tested in automated attacks.
: A similar comprehensive list is available in the Karanxa repository .
If you have a legitimate target (your own lab or authorized test), here are tools that can use your free wordlist: Absence of Rate Limiting A 6-digit OTP wordlist
If a penetration test reveals that an API accepts hundreds of OTP attempts without breaking, the application is highly vulnerable. Developers must implement the following defenses: 1. Enforce Strict Rate Limiting
This is the single most effective defense against brute-forcing. Applications must limit the number of verification attempts allowed per user session, IP address, or phone number/email.
Or perhaps you want to learn how to generate a instead of a sequential one? If you are prepping for a security audit, we can also discuss how to configure Burp Suite Intruder for legal rate-limit testing. Share public link
As a developer or system architect, preventing a 1-million-combination wordlist from breaking your authentication flow requires implementing strict server-side controls. Implementation Checklist for Secure OTPs Security Control Recommended Practice Uses, Security & Best Practices Explained Theoretically, a
These wordlists are not designed for malicious intent but rather for and testing systems.
A complete list will contain unique codes. A wordlist of this size is often too large and slow for most live tests. However, it is a powerful tool to understand the theoretical total keyspace a brute-force attack must cover.
To generate a list containing all possible 6-digit combinations (from 000000 to 999999), you would use the following command: