NI numbers in United Kingdom's official structure — the right length and layout, including any check digit where the format defines one. Entirely synthetic; never a real, issued number.
NM 27 06 99 B| Browser | sampuli.site — pick United Kingdom, generate, export CSV/JSON |
| REST API | curl https://sampuli.site/api/v1/gb/id?n=25 |
| npm | npx @sampuli/data gb.id |
| Node | import { generate } from '@sampuli/data'; generate('gb.id') |