GB · GBR
United Kingdom National Insurance Number format
Official and reviewed ID format references, with permanently masked examples for copy and QA. This site does not validate identity IDs.
National Insurance Number · Permanently masked examples
Data snapshot: Sources and data boundaries
Official public format
National Insurance Number
NINO
Regex
^[A-Z]{2} \d{2} \d{2} \d{2} [A-D]$SA 83 72 9* D
Regex and masked examples are reference only. This page does not validate identity IDs.
Data provenance
Sources
Data snapshot: 2026-10-05