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Reverse DNS with IP range from Arin

Posted on 2011-09-22
Medium Priority
Last Modified: 2012-12-06
I have two PTR records already setup with my ISPs for rDNS. I also have two IP blocks from My email is coming/going  on this IP from Arin. This IP is nat'd back to the spam filtering appliance which in turns forwards it to the exchange server.

Example: When i email someone that checks for rDNS the IP they see is (Not the ISP IP address). how do i assign a hostname to this IP?
Question by:cslt
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LVL 10

Expert Comment

by:Benjamin MOREAU
ID: 36582871
I think you have full NAT configured (or one-to-one NAT).

So, simply ask your ISP to add a reverse DNS record on your @IP Your ISP can add reverse DNS on all @IP that he deliver to you.
LVL 21

Expert Comment

ID: 36583080
ARIN provides utilities for this.

Everything you should need for this can be found here.

Accepted Solution

cslt earned 0 total points
ID: 37142794
That didn't work. I am hiring a consultant to fix this issue.
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Author Comment

ID: 37142798
Please close this question.
LVL 21

Expert Comment

ID: 37142942
What didn't work exactly?

Have you delegated NS authority for your IP blocks to a nameserver you can add a PTR record to?
LVL 21

Expert Comment

ID: 37211801
Hi, is this still an issue?

Author Closing Comment

ID: 38665369
Hired a consultant

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