Define maximum for us?

I use Namecheap and like their services. They have domain privacy aka it’s registered with their information instead of yours. If you just want to hide your name from people Googling or using a domain whois lookup, that’ll do the trick. If you’re trying to hide from people, you might need something more specific.

You using a Cisco firewall or something?

Depends on what system you’re running, and especially what task you’re doing. Trying to operate firewall rules via CLI is an exercise in self-inflicted pain, as is trying to set a complex cron schedule without a handy calculator.