To respect the privacy of my users I'm trying to anonymize their IP addresses in nginx log files.

One way to do this would be defining a custom log format, like so:

log_format noip '127.0.0.1 - [$time_local]  '
    '"$request" $status $body_bytes_sent '
    '"$http_referer" "$http_user_agent" $request_time';

This method has two downsides: I can't distinguish between two users and can't use geo location tools.

The best thing would be to 'shorten' the IP address (87.12.23.55 would become 87.12.23.1).

Is there a possibility to achieve this using nginx config scripting?

logging nginx ip anonymize
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