Nautilus Institute

It’s on! @DEF CON has announced the call for CTF organizers

DEF CON® Hacking Conference - Call for CTF Organizers

Nautilus Institute is passing the torch, will your group be the next CTF Overlords?.

We’ve got a small collection of resources for prospective groups:

Nautilus Institute

Resources for Future Organizers

Links and other resources for future organizers of Capture the Flag (CTF) hacking contests

If you have other links, please share!

Want the canonical results from @DEF CON CTF qualifiers from April? We've posted the statdump

def con quals data dump

Thank you for playing @DEF CON CTF Qualifiers! It's been an absolute joy running the contest for you this weekend, and the last four years! See you at @DEF CON in Las Vegas!

We've got six hours of @DEF CON CTF qualifiers remaining! It's time to pick and choose which challenges you want to chew on, and which can chill for another time.

Welcome to the last twelve hours of @DEF CON CTF qualifiers! We hope you’re still on the path to finals, or at least enjoying the sights along the way :) Game’s still live at

def con quals data dump

We're halfway through @DEF CON CTF qualifiers for 2025! Congratulations to all the teams that have solved challenges in the last 24 hours, and happy hacking to the teams solving many more!

def con quals data dump

congratulations to Hubert Hackin''' for solving 🐱‍💻🌐 in just 3m22s

One hour before @DEF CON CTF qualifiers start! Get your team together and sign up at

def con quals data dump

to be ready when the game starts at midnight UTC

Just two hours until we kick off @DEF CON CTF qualifiers! Join the fun at

def con quals data dump

In just 24 hours, @DEF CON CTF qualifiers will spring to life! Join us for a weekend of brilliant binaries, floral fuzzing, and exuberant exploits at

def con quals data dump