Hacker News Reader

Comment by chrisseaton | Hacker News Reader

> You can't get 125 million folks into this address space?

I think some people are now using a new card number per transaction, with these disposable card numbers, aren't they?

You're talking about services like Google/Apple Pay right? Aren't these credit card numbers rotated by Google/Apple, and they just keep some mapping of userIds, transactionIds, and rotated cardIds?

No I think you can genuinely get disposable real credit card numbers.

https://www.theukdomain.uk/virtual-credit-card-numbers-every...

privacy.com

My Citi card comes with a desktop app that can generate new numbers for online payments all the time. Beyond one-time use, I can generate a number that will work only with ‘x’ company for ‘x’ number of months. When I saw that, I assumed Citi+MasterCard must have at least 10,000s of times more numbers than customers

Yes, but in this case you can actually rotate those numbers easily without running into any issues, and on top of that they usually consume just one BIN per service.

We are lucky they don't use a disposable IPv4 address per page, that would break the Internet /s.

Not really sure what point you're trying to make, sorry?

Disposable CC numbers (one time use) is a waste of a very limited resource.

‘/s’ usually means sarcastic when you see it on this site, but you’ve used it in a comment where you meant what you said (you do think it’s good we’re not wasting IP addresses in the same way). That’s why it’s confusing.

Reply on news.ycombinator.com