Instant UK Company & VAT Verification
Verify official registration status, corporate filings, and VAT validity directly from Companies House and HMRC records.
- Official Public Data
- Live HMRC & Companies House Sync
- No Sign-up Required
Popular Company Lookups
Search allPopular Postcode Guides
Look up a postcodeBulk CSV Guide
Check hundreds of UK companies, VAT numbers or postcodes in one go — up to 5,000 rows per batch. No API needed.
Why Use qxx.uk
A compliance-grade lookup tool powered purely by official government open data.
Direct Government Feeds
Connected to official Companies House & HMRC APIs for up-to-the-minute accuracy on every check.
Instant Risk Screening
Detect dissolved entities and invalid tax registrations before you sign a contract or pay an invoice.
Developer First
Clean JSON endpoints available for automated supplier onboarding and compliance workflows.
Always Fresh, Always Fast
Intelligent caching keeps answers millisecond-fast while staying within official API limits.
Frequently Asked Questions
Where does this data come from?
What is a valid UK VAT number format?
Is this service free to use for B2B checks?
How up to date is the information?
Knowledge Base
In-depth guides covering VAT verification, Companies House filings, supplier screening and fleet compliance.
How to Verify UK VAT Numbers Before Paying Invoices (Step-by-Step Guide)
A step-by-step guide for finance and AP teams to verify a UK VAT number against HMRC before releasing payment, with format rules, fraud signals and a free lookup workflow.
7 min readCompanies HouseUnderstanding Companies House Filing Deadlines and Penalties
A clear explanation of UK company filing deadlines — confirmation statements, annual accounts and overdue penalties — and how to monitor them for your own company and your suppliers.
8 min readSupplier RiskDissolved vs Active Companies: How to Screen B2B Suppliers in the UK
How to read a Companies House company status and use it to screen B2B suppliers — understanding active, dissolved, liquidation and administration, and what each means for your risk.
7 min readFleet & TransportA Complete Guide to London ULEZ & Congestion Charge for Commercial Fleets
How commercial fleet operators identify the London ULEZ and Congestion Charge zones, check vehicle compliance, and budget for daily charges using postcode lookups.
8 min readCompanies HouseUnderstanding SIC Codes: What They Tell You About a UK Company
What SIC codes are, how Companies House uses them, and how risk teams can use them to classify suppliers, detect anomalies and flag potential shell entities.
6 min readCompanies HouseConfirmation Statements for UK Companies: What They Are and Why They Matter
A plain-English guide to the Companies House confirmation statement — what information it contains, when it is due, the consequences of missing the deadline, and why B2B buyers should monitor it.
6 min readFree lookups. Cheap automation.
Individual checks always stay free. When your team needs scale — 10,000 API calls, 5,000-row CSV batches, compliance PDFs or lead data — plans start at $9.99 / month.