The Membership Administration

Like every large organisation the Chaos Computer Club doesn’t get by some bureaucracy. The office manages all your matters regarding your membership or Datenschleuder subscription.

From the membership administration, to identify you easily, you’ll get a small (at the time 5 digit) number assigned. We call this number Chaosnummer (chaos number). Once you became a member the membership administration will make sure that your name appears on your designated Datenschleuder and the cash desks at the Congresses and Camps know to give you a discount. If you let the payments slide for too long the membership administration might send you friendly payment reminders as well.

You can get in touch with the membership administration via e-mail at [email protected], and we recommend – as for any e-mail communication – to encrypt your e-mails to us using PGP (our key). The current key’s fingerprint is:

pub   ed25519 2026-04-02 [SC] [expires: 2027-04-02]
      642D814B43E2FFFCC3FD50704FF2E0B8C5CA29F1
uid           CCC Mitgliederverwaltung (Key 2026) 
uid           CCC Membership Administration (Key 2026) 
sub   cv25519 2026-04-02 [E] [expires: 2027-04-02]

The membership administration is also available via snail mail at

Chaos Computer Club e. V.

Mitgliederverwaltung
Zeiseweg 9
22765 Hamburg

GERMANY

Before you contact the membership administration please check quickly in our membership section or in our FAQ. Maybe your question is answered there already.