How to fix Pingdom warnings about my DNS configuration

How to fix Pingdom warnings about my DNS configuration

I just set up my 2 name servers. I have them on two separate servers I
rent. The primary and secondary DNS for all of my websites work just fine.
I ran a test on Pingdom and received 2 warnings:
Name Server
Reverse for xxx.xxx.xxx.xxx points to an unknown host name
(xxx-xxx-xxx-xxx.dedicated.codero.net). The PTR record for the address
points to an unknown host name.
SOA
Reverse for xxx.xxx.xxx.xxx points to an unknown host name
(xxx-xxx-xxx-xxx.dedicated.codero.net). The PTR record for the address
points to an unknown host name.
So the same error on both. The reverse is bound to the static name
provided by Codero where I rent my servers. What should I change on my end
to fix this?
Thank you