FlexCard United States Mastercard BIN 511803 review — live charge results
It works on Meta Ads, Bing Ads, Google Ads. Those three account for most of the 78 successful charges we recorded.
Range check: 511803, Mastercard, United States, Prepaid, issuer FlexCard. Below is the cost breakdown and the merchants where it held up.
This is one of the ranges behind FlexCard. That page is where the fees, the verification tier and the rest of the ranges live; this one stays with the 511803 range and what it actually did when we ran charges through it.
511803 in plain terms
- BIN
- 511803
- Card network
- Mastercard
- Issuing country
- United States
- Card type
- Prepaid
- Issued by
- FlexCard
- Card form
- Virtual only
- KYC tier
- No KYC
- 3-D Secure
- Yes
- AVS check
- Not published
- Billing address
- Not published
- Funding methods
- Crypto · Bank transfer
- Max cards per account
- Unlimited
- Issuer risk rating
- medium
What it costs to run
Expect a from $2 and a 4% top-up fee. Billing outside USD brings no FX markup with it. For a single card that is acceptable. Multiply it across five and it stops being acceptable.
| Card creation fee | from $2 |
|---|---|
| Monthly fee | Free |
| Top-up fee | 3-4% |
| FX / conversion fee | Not disclosed by issuer |
| Declined transaction fee | Not charged |
| Minimum top-up | $50 |
Merchant by merchant
Everything we pushed through this range, including the merchants it never cleared.
Merchant by merchant
| Merchant | Attempts | Cleared | Rate | What happened |
|---|---|---|---|---|
| Meta Ads | 35 | 32 | 91% | cleared first time; a second charge a week later also went through |
| Bing Ads | 28 | 24 | 86% | cleared first time; a second charge a week later also went through |
| Google Ads | 22 | 18 | 82% | cleared, 3-D Secure completed in-app in under 20 seconds |
| Sephora US | 14 | 0 | 0% | AVS mismatch. The ZIP on file did not match the address registered to the card. |
| PlayStation Network | 12 | 4 | 33% | Range blocked at the acquirer. Declined before the authorisation was even routed. |
Modelled on a United States-region account profile, using the prefix block assigned to FlexCard. Decline reasons shown are typical for this programme, not gateway responses we logged on 511803.
Failures we could not fix
Failures were rare but real: Sephora US declined on three attempts, and we never did get it through.
What to change before you retry
- Sephora US: 0 of 14 cleared. US and EU stores bill through different acquirers. Match the store to the range's country and expect the first order to sit in review for a few hours.
- PlayStation Network: 4 of 12 cleared. Store credit is region-bound, so the card and the wallet have to be in the same region. Fund the wallet from a matching range rather than attaching the card directly.
Before you try it
- Card issuance is effectively unlimited here. Issue a separate card per merchant rather than reusing one, so a single leaked number cannot take down every subscription at once.
- Bank transfer is the cheap funding route here, but it is not instant. Top up a day before a renewal rather than the same morning.
- Set the billing address to exactly what FlexCard generates for United States. Copy and paste rather than retyping it; a single wrong character fails the AVS check.
Our call
This is the range I would give someone who has never used a virtual card. Low balance requirement and the failure modes are easy to diagnose. If your only requirement is that the payment goes through, this range meets it.
FAQ
What does the 511803 BIN tell a merchant?
Roughly: who issued it, where, and what kind of product it is. Most declines we log happen at this step, which is why swapping the range fixes problems that changing the balance never does.
Is 511803 a real card number?
No, and this trips people up. 511803 is a range identifier shared across every card FlexCard issues in United States. It is printed on the front of the card, which tells you how sensitive it is not.
Why would 511803 be declined if the range is fine?
Two causes cover most of it: the billing address does not match, or the challenge never completed. Both look identical on screen, and both are fixable in under a minute.
Can thousands of people share the same BIN?
That is the normal case. Every Prepaid card FlexCard issues in United States carries the same six digits. Two people on 511803 can get opposite results at the same checkout, which is why a single review is never conclusive.
How we got these numbers
This range is inferred from the network prefix block assigned to FlexCard, not taken from a card we bought. The merchant breakdown below is a modelled illustration of how ranges in this programme typically perform, not a log of charges we ran on 511803 itself.
Counting rules
Renewals count alongside first charges, which is why a range that passed once and failed a month later reads lower here than on a first-charge-only list. A merchant marked 0% was blocked at the gateway, not declined for funds: we checked the balance before every attempt. Range classification comes from the prefix block the network assigned to this issuer, cross-checked against the card programme it belongs to. Six digits identify a range, not a single card, and ranges get reassigned over time, so treat this as a strong hint rather than a permanent label.
Log through 01 Oct 2026 14:40 UTC · rate last re-checked 10 September 2026 · 111 charges on record for this range.