Discover Model Name from Service Tag or Express Service Code

Hi there, first post here :)

I have a table that's got roughly 200 - 250 Dell Service Tags with matching Express Service Codes. I need to find out the model name from each service tag or express service code. Obviously I can copy and paste every single one into Dell's website, but I was wondering if there's a better way of doing it, say for example (The first 2 characters of the service tag determine if its a desktop, laptop, netbook, monitor, the next 2 are the model number as a Hex value, the next 2 represent when the warranty expires etc...)

Thanks in advance!