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Regular Contributor
Angko
Posts: 115
Registered: ‎04-23-2013

Credit Card Number Exhaustion

This just came into my mind when I was at work last week allocating an IP addresses to some of our servers when I noticed that our pool of IPs are near depletion. I wonder what happens when the pool of available 16-digit credit card numbers gets depleted and reaches to zero? Can they recycle used/disconnected card numbers?



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Revelate
Posts: 8,350
Registered: ‎12-30-2011

Re: Credit Card Number Exhaustion


Angko wrote:

This just came into my mind when I was at work last week allocating an IP addresses to some of our servers when I noticed that our pool of IPs are near depletion. I wonder what happens when the pool of available 16-digit credit card numbers gets depleted and reaches to zero? Can they recycle used/disconnected card numbers?


Yes.

 

Also there's a metric ton more credit card numbers (16^10) vs the 4 billion addresses in IPv4; and it's nowhere close to the rate of use either I suspect.  

 

Speaking as someone who once did backbone engineering, I'm not worried about CC number exhaustion :smileyhappy:.

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Established Contributor
cashnocredit
Posts: 959
Registered: ‎07-18-2009

Re: Credit Card Number Exhaustion


Angko wrote:

This just came into my mind when I was at work last week allocating an IP addresses to some of our servers when I noticed that our pool of IPs are near depletion. I wonder what happens when the pool of available 16-digit credit card numbers gets depleted and reaches to zero? Can they recycle used/disconnected card numbers?


Sure. They recycle CC#s.  Some banks also recycle old checking account numbers. My Amex CC#, closed in the 80's, was recycled.

I have reestablished credit over the last couple years
so my moniker is, well, rather out of date.

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Established Contributor
cashnocredit
Posts: 959
Registered: ‎07-18-2009

Re: Credit Card Number Exhaustion


Revelate wrote:

Angko wrote:

This just came into my mind when I was at work last week allocating an IP addresses to some of our servers when I noticed that our pool of IPs are near depletion. I wonder what happens when the pool of available 16-digit credit card numbers gets depleted and reaches to zero? Can they recycle used/disconnected card numbers?


Yes.

 

Also there's a metric ton more credit card numbers (16^10) vs the 4 billion addresses in IPv4; and it's nowhere close to the rate of use either I suspect.  

 

Speaking as someone who once did backbone engineering, I'm not worried about CC number exhaustion :smileyhappy:.


You meant 10^16 I'm sure. Like IPs, the leading digits of credit cards are assigned in clusters to banks and there is also a check digit which cuts the numbers a bit. Still, there are plenty CC numbers to be had.

I have reestablished credit over the last couple years
so my moniker is, well, rather out of date.

WM Discover $1800, WF Plat 12k, Chase Freedom Siggy15k, Amex Plat (60k H/B), Citi AA EWMC 25k
Regular Contributor
Angko
Posts: 115
Registered: ‎04-23-2013

Re: Credit Card Number Exhaustion

That's nice info! I didn't know that they can recycle used numbers. All the while I thought eventually there will be an IPv6-version of credit card numbers. :smileyhappy:



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Valued Contributor
thom02099
Posts: 1,317
Registered: ‎08-30-2011

Re: Credit Card Number Exhaustion


cashnocredit wrote:

Angko wrote:

This just came into my mind when I was at work last week allocating an IP addresses to some of our servers when I noticed that our pool of IPs are near depletion. I wonder what happens when the pool of available 16-digit credit card numbers gets depleted and reaches to zero? Can they recycle used/disconnected card numbers?


Sure. They recycle CC#s.  Some banks also recycle old checking account numbers. My Amex CC#, closed in the 80's, was recycled.


+1.  They are not unique numbers and I know that, at least in the past, numbers could be re-issued as soon as 6 months from date of cancellation of the number to a previous cardholder.  Those of us who have been around a while remember those little "magazines" that retailers used to have of stolen credit card numbers, they would have to look them up to see if they were stolen.  I'm sure the card issuers have automated the process.  However, since they are NOT unique numbers, law enforcement cannot enter the credit card numbers in their state or national crime information databases (Yes, NCIS is wrong about that!)

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Established Contributor
CashOnDelivery
Posts: 502
Registered: ‎04-17-2013

Re: Credit Card Number Exhaustion

Interesting topic. Well AMEX has 15 numbers and the others have 16. Perhaps they either:

a)add a letter at the end to indicate which network it is (e.g, M-Master Card, V-Visa, D-Discover)

b)expand the amont to 17 or 18

 

Just ideas...


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Member
allthebest
Posts: 5
Registered: ‎03-15-2011

Re: Credit Card Number Exhaustion

FYI first number of a credit card indicates what type it is. 3-Amex, 4-visa, 5-master, 6-discover.
Regular Contributor
Angko
Posts: 115
Registered: ‎04-23-2013

Re: Credit Card Number Exhaustion


allthebest wrote:
FYI first number of a credit card indicates what type it is. 3-Amex, 4-visa, 5-master, 6-discover.

And adding to the list:

Starts with 34 and is a 15-digit number - Amex

Starts with 37 and is a 15-digit number - Amex

Starts with 3 and is a 14-digit number - Diners

Starts with 3 and is a 16-digit number - JCB

Starts with 2131 or 1800 - JCB

Start with 6011 - Discover

 

So... if we can determine the card network based on the prefix of the card number, why do majority of the shopping carts has pull down selection menu where you select the network for the credit card numbers you just entered? Hahaha!

 



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Valued Contributor
injustifiiable
Posts: 1,846
Registered: ‎03-30-2012

Re: Credit Card Number Exhaustion


Angko wrote:

allthebest wrote:
FYI first number of a credit card indicates what type it is. 3-Amex, 4-visa, 5-master, 6-discover.

And adding to the list:

Starts with 34 and is a 15-digit number - Amex

Starts with 37 and is a 15-digit number - Amex

Starts with 3 and is a 14-digit number - Diners

Starts with 3 and is a 16-digit number - JCB

Starts with 2131 or 1800 - JCB

Start with 6011 - Discover

 

So... if we can determine the card network based on the prefix of the card number, why do majority of the shopping carts has pull down selection menu where you select the network for the credit card numbers you just entered? Hahaha!

 


LOL @ Diner's...if I remember correctly, didn't those 14 digit numbers transition to 16 and are treated as MasterCards?

 

Diners Club is so '80s.

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