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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, 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   rsa4096 2022-03-09 [SC] [expires: 2023-03-30]
      9C1C 64B5 F300 D323 326C  6386 1B94 0899 BBE9 8F86
uid           [ unknown] CCC Office Key (CCC Mitgliederverwaltung, Key 2022) 
uid           [ unknown] CCC Office Key (CCC membership administration, key 2022) 
sub   rsa4096 2022-03-09 [E] [expires: 2023-03-30]

The membership administration is also available via snail mail at

Chaos Computer Club e. V.

Zeiseweg 9
22765 Hamburg


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