UK CRN Validator (Company Registration Number)
Validate UK Companies House numbers covering England & Wales, Scotland (SC), Northern Ireland (NI) and LLPs.
About the Company Registration Number (CRN)
The CRN is an 8-character unique identifier allocated by Companies House to all incorporated entities in the UK.
It must be clearly stated on all corporate stationery, official correspondence, invoices and websites.
Anatomy & Structure of UK Company Number (CRN)
The UK CRN consists of exactly 8 alphanumeric characters:
| Position | Field | Length | Meaning & Rule | Example |
|---|---|---|---|---|
| 1 to 2 | Territorial Prefix | 2 characters | Jurisdictional letters ('SC', 'NI', 'OC', 'RC', etc.) or digits for England & Wales | SC |
| 3 to 8 | Sequential Number | 6 to 8 digits | Unique sequential registration number issued by Companies House | 002116 |
Official Companies House Taxonomy
Statutory taxonomy under the UK Companies Act 2006:
^(?:[0-9]{8}|(?:SC|NI|OC|SO|NC|RC|LP|SL|NL|FC)[0-9]{6})$
- 1. Strip spaces and hyphens, transforming letters to uppercase.
- 2. Ensure the string length is exactly 8 characters.
- 3. Confirm that it matches either 8 numeric digits or 2 valid prefix letters followed by 6 numeric digits.
- 4. Identify the corresponding jurisdiction (England & Wales, Scotland, Northern Ireland, LLP).