Unique S/N Generator?

[Amichai Rotman]

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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