iki.fi is an all volunteer non-profit small organisation trying to help people communicate better using the internet.
If the IP address of the server is in an IP address block listed on the page https://ikiwiki.iki.fi/faq/ikiniposoitteet then you can contact firstname.lastname@example.org (the board of the society).
Other *.iki.fi servers and subdomains are hosted by our members themselves. For issues with e.g. example.iki.fi you can contact email@example.com with email and Cc: firstname.lastname@example.org. All of our members are individual persons.
If you help find a security problem on iki.fi servers, we may be able to pay a small bug bounty depending on the severity of the issue.
Please contact the member and/or email@example.com with your bug report. Try to include enough details and information so we can identify the problem and try to fix it. We appreciate bug reports and try to take actions quickly.