[Tomte]

I won‘t address „ethical“, but collecting full IP addresses has been discussed as possibly illegal in Germany for years now.

And since the recent European court decision, I suppose it is settled: yes, illegal.

[aeorgnoieang]

What's a 'not full' IP address?

[matt4077]

Leaving the last three digits out of logs gives you all the information you might need without making it possible to tie it back to a specific user. Google Analytics actually has an option for that.