It depends on your ISP and whether your netblock is tied to them.

If you have PI (provider independent) space you can delegate the DNS servers at 
the registry to whoever you wish.

If you have PA (provider allocated) space you're left with your ISP and whether 
they will delegate out your block or not.

I've noticed that some DNS providers seem to charge a lot more for reverse DNS 
than forward DNS.  Not sure there's a technical reason for that tbh.
________________________________________
From: Kurt Buff [[email protected]]
Sent: 03 September 2011 12:53 AM
To: NT System Admin Issues
Subject: Re: When DNS for your ISP goes down...

On Fri, Sep 2, 2011 at 12:23, Ben Scott <[email protected]> wrote:
> On Thu, Sep 1, 2011 at 12:05 PM, Steven Peck <[email protected]> wrote:
>> If you move your DNS now, your DNS will be ISP vendor
>> neutral/independent and that's something that can be done
>> easily now if your connectivity suffers in the future it's one less
>> thing to do later.
>
>  +53
>
>  Having your DNS tied to your connectivity or web hosting provider is
> not good.  Having it independent means you can change other things
> much easier.  Highly recommended.
>
>  For example: Suppose you're changing connectivity providers at the
> office hosting your mail.  With independent DNS, you simply add a new
> A record and a new MX record, leaving the old records intact.  You
> allow time to propagate.  Then switch cables, then cancel the old
> service.  Nobody even notices.
>
> -- Ben

Forgive the ignorance, but where does this leave PTR records?

Kurt

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