Alternatively in the browser:

https://webirc.hackint.org/#32c3

https://webirc.hackint.org/#32c3-hall-1

https://webirc.hackint.org/#32c3-hall-2

https://webirc.hackint.org/#32c3-hall-G

https://webirc.hackint.org/#32c3-hall-6

https://webirc.hackint.org/#32c3-everywhere

JSON of all streaming URLs:

https://streaming.media.ccc.de/streams/v1.json