Hashcat, the popular password cracking tool, can generate candidate OTPs on the fly without storing huge files:
Allow no more than 3–5 OTP attempts per minute per user/IP. After 10 total failures, lock the account for 15 minutes.
Understanding 6-Digit OTP Wordlists: Brute-Force Risks and Security Best Practices 6 digit otp wordlist
The primary objective of testing with an OTP wordlist is verifying that an API endpoint actively throttles rapid requests. Testers feed the wordlist into automation tools to observe whether the server rejects requests after a specific threshold (e.g., 3 to 5 failed attempts). Concurrency and Race Condition Testing
IP addresses or user accounts are locked after multiple failed attempts. Securing Your Application Against OTP Brute-Forcing Hashcat, the popular password cracking tool, can generate
A 6-digit OTP wordlist is a file (usually .txt ) containing every possible 6-digit numeric combination in sequential order, from 000000 to 999999 .
Most reputable services will "throttle" or block an IP address after 3 to 5 failed attempts. Testers feed the wordlist into automation tools to
Security systems often flag sequential requests. To test rate-limiting thresholds effectively, researchers randomize the list order. This simulates independent, unlinked authentication attempts across a distributed environment. Behavioral and Optimized Lists
Increase delay after each failed attempt (e.g., 1s, 2s, 4s, 8s, 16s). This makes even a 1000-entry wordlist infeasible.
Provide a on an endpoint.