Unique S/N Generator?

[Albert Wagner]

On 02/07/2011 11:01 AM, Amichai Rotman wrote:
> Hello,
>
> I would like to hand out some Coupons to my customers granting the 2-3 
> hours free phone support as part of a marketing campaign.
>
> I am looking for a way to generate a unique S/N number / code 
> (preferably letters and numbers) for them to read back to me over the 
> phone, so I can verify it's authenticity and provide them the service.
>
> Is there a tool out there I can use?
>
> I'd like to set different ranges of codes for different target audiences.
>
> Thanks!
>
> Amichai.
I note that you have only specified "unique" not "random".  The numbers 
in any sequence from x to y by 1 are unique.  Put them in a hat and 
shake if they must be handed out in random order.