The simple validation module must be old. '55' had been a MC prefix for some
time, now.
Visa and MasterCard and the other card issuers make the determination of
prefixes. Your credit card processor can supply you with the latest ranges
and lengths. Here's the latest in my records
Card Range Length
VISA 400000-499999 13, 16
MasterCard 510000-559999 16
Amex 340000-349999 15
370000-379999 15
Novus 601100-601199 16
Diners Club 300000-305999 14,16
309500-309599 14,16
360000-369999 14,16
380000-389999 14,16
JCB Card 352800-358999 16
Daryl
> My question: Is there a source that provides this prefix information on
the
> various credit cards? I would like to keep informed as to new issues.
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