Centurion Digits?
 

What are the first 6 digits of The Centurion typically; i.e. does 3715 signify Centurion?
The first 6 digits of my Centurion Card come up as Platinum on the departures.com website. What’s going on here?

Platinum first four are 3713 and I believe all Platinum are 3713....Centurion shares the 3715 prefix with other common cards such as a green costco corporate. My guess is that Amex ran out of numbers. I really think Amex has way to many products on the market and is causing confusion. A good example is a poster on this board who thought a Platinum Optima was just the same as the Platinum charge.

My Amex Brokerage Platinum starts with 3715.

My plat. starts with 3712.

The first two digits '37 'designate that the account is amex, then the next two are market code (obv. more than one of those in use in big markets, but they are not unique to each card product given limited total sequence) thee next set of digits are your account number, then the final four are for logic encoding check.

hope this helps

Here is how the card number is formed :

37aa - bbcccc - cdeef

Two first digits : 37 = American Express
(Visa cards start with 4, Mastercards with 5, etc.)

aa = base currency code or card type
Some examples:
12, 15, etc. = US$ charge cards
42 = British pounds , 45 = US$ (International Dollar cards)
50 = Deutsche Mark (now Euro)
49 = French Francs (now Euro)
46 = some Optima credit cards
etc. etc.

bb + ccccc = account type and number
bb : 88 for Centurion cards (or old Platinum accounts).
Other Platinum or Gold cards start with '8'
bb starts with '9' for corporate cards
etc. etc.

d = card sequence number
Numbered from 1. If you loose your card, the new one will be issued with 2, then 3 etc.

ee = supplementary card sequence number.
00 : main card
01 : 1st supplementary card
then 02, 03, etc.

f = check number
To check the formal correctness of the card number

So if someone was to "steal" my card that was for example

3760 123 456 71000

and I were to report it to amex, the person who stole my card should know that my new card number is:

3760 123 456 7200X

With X being a check digit that they could get off the internet or work out VERY quickly?

I know from past losses amex keep the same expiry date for "lost / stolen" cards so the thief would know the new card number and expiry date. It does not sound to secure to me http://www.flyertalk.com/forum/smile.gif

At one time, the last sequence had significance. If you had a 100 in that grouping, it meant your credit was higher. In the case of Centurion, that should not be an issue, but I do believe that last bunch of numbers is where things are coded.

Your card also contains a 4 digit code - which will be different for each card you are issued with. this is required for transaction authorisation in most cases - so the card thief will not be able to obtain all information on your account from the stolen card.

I don't mean to be a pest, but first b# is a 9, and I have a personal, not a corporate card.

The first 6 digits of my Centurion Card register as The Platinum Card when I sign into Departures.com - has this happened to anyone else?

some clarification :

WhiteAmex : Centurion card numbers look like 37xx-88xxxx-xxxxx , but this is also true for older Platinum cards (as Plat used to be the elite product...).
Departures.com needs an update ...

deelmakur: the 1st card (main card) has always x100x as the last digit sequence. "100" has no other meaning than "first issued card for the main cardholder".

MarshKing: the "99" rule is still correct in some european countries : 37xx-99xxxx-xxxxx. In the last years, Amex introduced many new products in the US, issued millions of new cards (blue, co-branded, etc.) and had to define some other "aa+bb" field combinations. There are also differences between Corporate card accounts for large corporations (with more than 99 supplementary cards) and Small Business accounts. Thanks for the info.

GK: the printed 4 digit number (the card series Nr.) is the same for many thousands of raw cards of the same type. If you loose a Centurion, the probability is high you'll get the same number for many monthes...

My Centurion is 37xx-65xxxx-xxxxx

What does that mean?

My C card is:

3715-69xxxx-xxxxx

Eddie Whitman

Also, my old Blue card was 3715-69xxx

Eddie Whitman