We’re happy to finally announce the presale for this year’s Chaos Communication Congress. It will work pretty much the same as last year:

We’ll again be using our system of replicating vouchers. The presale will run in two phases: the voucher phase and the open sale.
We’ll explain this as briefly as we can here. If you want to read more about it, we also have a documentation page available, where we’ll add more information in the coming days.

The voucher phase will run from 2025-10-21 until 2025-11-12 and works as follows:

• There is a fixed quota for this phase. Once this quota is …

We invite you to enrich our programme with your lectures and the 39C3 with music, art, and punk. The call for participation in four fields is now online.

The Chaos Computer Club (CCC) is inviting to the 39th Chaos Communication Congress in Hamburg at the end of December and is now asking for your ideas for lectures. You can also support the best hacker party of the year with your music and art performances and with punk.

Please read our Call for Participation carefully, before submitting ideas. It includes practical tips and guidance on how to best present your submission and how to avoid …

Book your holiday, dog-ear your calendar, order a suitcase, check the bed exchange and wash your congress shirts: Between 27 and 30 December 2025, it will once again be time to join the Chaos Computer Club in organising, experiencing and celebrating Europe’s biggest and most relaxed hacker party, net culture party and tech conference. For this year’s edition, we will open Hamburgs Congress Center’s doors under the motto “39C3: Power cycles”, you can read the invitation on the CCC website for the proper pep talk:.

Get ready to join hundreds of like-minded …