Openbulletwordlist Review

# Convert username:pass to email:pass
sed 's/^/user@domain.com:/' userlist.txt
If you take a generic rockyou.txt wordlist (which only contains passwords) and feed it into OpenBullet, it will fail. OpenBullet needs a pairing. Even if you are testing only usernames, you must format the file as username: (with an empty password slot).
Split one massive wordlist into 10 smaller parts. openbulletwordlist
Crucial Disclaimer:

This information is provided for educational and defensive security purposes only. OpenBullet is a tool often associated with "Credential Stuffing" (automated login attempts using stolen credentials). Unauthorized access to computer systems (even with a found password) is illegal under laws like the CFAA (US), Computer Misuse Act (UK), and similar worldwide. Only use such techniques on systems you own or have explicit written permission to test. # Convert username:pass to email:pass
sed 's/^/user@domain