Subtraction v Hex2Dec in vbscript

Thanks everyone.  Here is more information:  I time races 5k, marathon, trithlons, etc) and I encode my own RFID tags.  I have to make sure that there is little or no reasonable chance of conflicting with things like rfid tags that are put into shoes, etc.  However, ultimately I have to have decimal numbers to work with.  So the two options I have landed on are these:

1) I could encode the tags using 6 decimal digits (I have never seen a six-digit decimal rfid value come through my system).  For instance, rfid tag 100001 would be used for bib #1, rfid tag 100002 would go on bib #2, etc.  Then I just loop through and subtract 100000 from each tag before processing the results.

2) I could encode the tags using hex numbers and just convert to decimal prior to processing the results.

I prefer the first method because it is human-readable but it is even more important to process quickly.

Thanks for any additional clarity you can provide.  I will look at the above links, code, suggestions, ...