Free Arena is for everybody and forever. The reason that some time some servers from Free Arena are down is because many users are new into infosec and act as skiddies most of the time. All servers from Free Arena have a cron job to automatically rebuild them.
- In Free Arena you can play with Metasploitable 2 (10.195.2.2) WebGoat (10.195.0.12:8080) or with Security Shepherd (security-shepherd.ctf365.com).
- So far looks like all are up and running.
- You have 30 days free trial and if you want to "mess around" then Main Arena would be the place (10.194.0.1/24)