What Does a Social Security Number Look Like?

A Social Security number is a nine-digit identifier written as three groups separated by hyphens, in the pattern XXX-XX-XXXX — for example, 123-45-6789. It appears on a wallet-sized paper card issued by the Social Security Administration, printed on blue-tinted banknote paper that carries the SSA seal, your full legal name, the nine-digit number, and a signature line.1Social Security Administration. Meaning of the Social Security Number

The Nine-Digit Format

The number is always nine digits, broken into a three-digit block, a two-digit block, and a four-digit block. That 3-2-4 pattern is how the number is printed on the card itself, on W-2s, and on nearly every tax or financial document that displays it.1Social Security Administration. Meaning of the Social Security Number

The hyphens are formatting, not part of the identity. The actual number is the nine digits, so you’ll see it written as 123-45-6789 on paper forms and as 123456789 in many electronic filing systems. Both refer to the same number.

What the Three Segments Are Called

Each block has a name, though the original logic behind the first two has been retired.2Social Security Administration. Social Security History – Social Security Numbers

  • The first three digits are the area number. Before 2011, these indicated the state or region where the card was applied for. That geographic link no longer exists.
  • The middle two digits are the group number, ranging from 01 to 99. They were originally used to divide records into smaller filing batches.
  • The last four digits are the serial number. These identify you within the group and are the four digits banks and other institutions commonly ask for over the phone.

On June 25, 2011, the SSA moved to a system called SSN Randomization. Under that system, the first three digits no longer correspond to any geographic area. The change was made to protect privacy and extend the lifespan of the nine-digit numbering system.3Social Security Administration. Social Security Number Randomization

Combinations That Never Appear on a Real SSN

Some digit patterns are permanently off-limits. If a number matches any of these, it isn’t a genuine Social Security number:4Social Security Administration. Social Security is Changing the Way SSNs are Issued

  • Area number of 000.
  • Area number of 666.
  • Area number starting with 9 (that range is reserved for ITINs).
  • Group number of 00.
  • Serial number of 0000.

The best-known invalid number is 078-05-1120, printed on sample wallet inserts by a pocketbook manufacturer in 1938. Thousands of people mistook it for their own, and the SSA eventually voided it.

Telling an SSN Apart From an ITIN

An Individual Taxpayer Identification Number looks almost identical to a Social Security number at a glance. It is also nine digits and uses the same NNN-NN-NNNN format. The difference is the first digit: every ITIN begins with 9, which is the one area-number prefix the SSA never uses.5Internal Revenue Service. Taxpayer Identification Numbers (TIN)

The IRS issues ITINs to people who need a federal tax ID but don’t qualify for an SSN. An ITIN cannot be used to work legally in the U.S. or to claim Social Security benefits. A nine-digit number starting with 9 is an ITIN, not an SSN.

What the Card Itself Looks Like

The card is roughly the size of a business card, printed on specially designed banknote paper with a blue-tinted marbled background. The pattern is intentionally irregular and hard to reproduce with a scanner or copier.6Social Security Administration. Report to Congress on Options for Enhancing the Social Security Card – Section: Security Features

The front shows the SSA’s official seal, the phrase “This number has been established for,” the cardholder’s full legal name, and the nine-digit number. A signature line runs across the bottom. The paper has a texture similar to U.S. currency because it is produced from the same type of banknote stock federal law requires for these cards.7Social Security Administration. Social Security Number Card Security Features

Security Features to Check

Cards issued since October 1983 include several anti-counterfeiting features:7Social Security Administration. Social Security Number Card Security Features

  • Color-shifting ink on certain printed elements that changes appearance when tilted.
  • Intaglio printing, meaning raised ink you can feel on parts of the front.
  • Hidden microtext along the signature line, made of tiny letters spelling “SOCIAL SECURITY,” visible only under magnification.
  • A latent image on the face that appears only when the card is tilted to a specific angle.
  • Planchettes: small yellow, pink, and blue discs embedded randomly on both sides.
  • An anti-copy background pattern that distorts visibly when photocopied.

Cards issued starting in February 1996 also carry a red fluorescent alphanumeric code on the back, visible under ultraviolet light. Cards issued from April 2007 onward include the date of issuance printed beneath the signature line. A card missing the features expected for its era is a warning sign.

The Three Versions of the Card

Not every card looks exactly the same. The SSA issues three versions, and the notation printed on the front determines how the card can be used:8Social Security Administration. Types of Social Security Cards

  • An unrestricted card shows only the name and number with no additional notation. It is issued to U.S. citizens and lawful permanent residents. This is the only version accepted as a List C document for Form I-9 employment verification.9U.S. Citizenship and Immigration Services. Form I-9 Acceptable Documents
  • A card printed with “VALID FOR WORK ONLY WITH DHS AUTHORIZATION” goes to people lawfully in the U.S. on a temporary basis who have work authorization from the Department of Homeland Security. Employers cannot accept this card alone for I-9 purposes.
  • A card printed with “NOT VALID FOR EMPLOYMENT” goes to people lawfully in the U.S. who don’t have work authorization but need a number for another reason, such as receiving certain government benefits. This card cannot be used to show employment eligibility.

The restriction text is printed directly on the face of the card, so a quick look at whether any additional legend appears above or below the number tells you which version you’re holding.