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Portuguese Social Security Number

  • Published on Sep 2, 2026
  • 1 minute(s) read
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Portuguese social security number is the NISS (Número de Identificação de Segurança Social) 11-digit number issued to people working in Portugal.

Validator

Portugal Social Security Number — Validates the position weighted Mod10 checksum.

Matched expressions

Regex expressions

Description

Score

(?:\b[0-9]{11}\b)

Matches an 11-digit number of the format NNNNNNNNNNN.

1



Ignored expressions

None

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