Lee, Thanks. I've come across similar tables. Trouble is each of them contains one or two more prefixes than the last one. For example, I've also seen the prefix 38 listed for Diners Club. Obviously prefixes are being added, albeit slowly, as needed. If I'd relied on the first table I came across, published maybe two or three years ago (Who knows when - it was on some developer's website without a date), then I might be rejecting cards that were issued in the last couple of years.
I've got the Luhn mod-10 checksum algorithm implemented in both JavaScript and CFScript. I've also come across mention of a "check digit" (rightmost digit) and another algorithm to do a checksum against this digit. Perhaps it's just an alternative way of doing the mod-10 checksum. I haven't examined it that closely. What I'm really looking for is a more authoritative source for this information. Jim ----- Original Message ----- From: "Lee Fuller" <[EMAIL PROTECTED]> To: "CF-Talk" <[EMAIL PROTECTED]> Sent: Wednesday, November 28, 2001 9:35 PM Subject: RE: Credit Card Validation > Actually, here's even more info... > > > > *CARD TYPES *PREFIX *WIDTH > American Express 34, 37 15 > Diners Club 300 to 305, 36 14 > Carte Blanche 38 14 > Discover 6011 16 > EnRoute 2014, 2149 15 > JCB 3 16 > JCB 2131, 1800 15 > Master Card 51 to 55 16 > Visa 4 13, 16 > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Your ad could be here. Monies from ads go to support these lists and provide more resources for the community. http://www.fusionauthority.com/ads.cfm FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/cf-talk@houseoffusion.com/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
