Unique S/N Generator?

[Alex]

On Mon, Feb 7, 2011 at 11:01 AM, Amichai Rotman <amichai at iglu.org.il> 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.
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