Background: I have a domain registered through register.com and they have a form for me to setup a reverse zone. I also have a VPS at an IPv4 address x.x.x.x.
What I know: PTR/reverse zones are just the opposite of A records.. and instead of mapping a domain name -> ip address it maps an ip address -> domain name.
My problem: The form on register.com for setting up reverse zones/PTR records has a text-input box and then ".arpa" to the right of it. Do I simply enter in the ip address x.x.x.x of my VPS into this form so then I'd have something like x.x.x.x.arpa? Or is there something more complicated that I'm missing? I'm also interested in any resources anyone has that could teach me more about how the DNS system functions and the roles of different DNS records.