There are a few places you can look to find your SSN, but you can always request a new card if you come up empty. Many, or all, of the products featured on this page are from our advertising partners ...

Discover how the Luhn Algorithm verifies credit card accuracy, supports secure transactions, and helps prevent errors in inputting Social Security numbers.

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Mira Norian / Investopedia A bank identification number (BIN) is the initial set of four to ...