From 36C3 Wiki
Description nsupdate,info dyndns software and service
Has website
Organized by TW
Persons working on Elnappo
Tags python, dns, dyndns
Located at assembly Assembly:Python
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(Click here to refresh this page.) is a free dynamic DNS service. is also the name of the software used to implement it.

If you like, you can use it to host the service on your own server.